| U.S. 2000 Census Results - Summary File 1 | ||||
| Census Variable Name | Location name | Fairfield city | Percent | Description |
| P001001 | Total Population (100% Count), April 1, 2000 | 42,097 | 100.0% | All residents |
| HU100 | Total number of Housing Units (100% Count) | 17,789 | 100.0% | All housing units |
| P017001 | Average Household Size | 2.44 | ||
| P017A001 | Average Household Size (number of residents), White Householder | 2.44 | ||
| P017B001 | Average Household Size (number of residents), Black/African American Householder | 2.45 | ||
| P017C001 | Average Household Size (number of residents), American Indian/Alaskan Householder | 2.21 | ||
| P017D001 | Average Household Size (number of residents), Asian Householder | 2.63 | ||
| P017E001 | Average Household Size (number of residents), Hawaiian/Pacific Islander Householder | 2.50 | ||
| P017F001 | Average Household Size (number of residents), Other racial category Householder | 2.97 | ||
| P017G001 | Average Household Size (# of residents), Householder with 2 or more racial categories | 2.55 | ||
| P017H001 | Average Household Size (number of residents), Hispanic Householder, and race | 2.89 | ||
| P018001 | Households, total count | 16,960 | 100.0% | All households |
| P018002 | Number of ONE person Households | 4,515 | 26.6% | Percent of all households |
| P018003 | Number of ONE person Households - Male | 2,018 | 11.9% | Percent of all households |
| P018004 | Number of ONE person Households - Female | 2,497 | 14.7% | Percent of all households |
| P018005 | Households, total count of those with 2 or more residents | 12,445 | 73.4% | Percent of all households |
| P018006 | Households, total count of family households | 11,361 | 67.0% | Percent of all households |
| P018007 | Households, total count of Married-couple familes | 9,113 | 53.7% | Percent of all households |
| P018008 | Households, total count of married households with children under 18 years | 4,088 | 24.1% | Percent of all households |
| P018009 | Households, total count of married households with no children under 18 years | 5,025 | 29.6% | Percent of all households |
| P018010 | Households, total count of Other (not married couple) families | 2,248 | 13.3% | Percent of all households |
| P018011 | Households, total count of families with male householders, no wife present | 602 | 3.5% | Percent of all households |
| P018012 | Households, total count male householders, no wife present, with children under 18 | 343 | 2.0% | Percent of all households |
| P018013 | Households, total count male householders, no wife present, with no children under 18 | 259 | 1.5% | Percent of all households |
| P018014 | Households, total count of families with female householders, no husband present | 1,646 | 9.7% | Percent of all households |
| P018015 | Households, total count female householders, no husband present, with children under 18 | 1,073 | 6.3% | Percent of all households |
| P018016 | Households, total count female householders, no husband present, with no children under 18 | 573 | 3.4% | Percent of all households |
| P018017 | Households, total count of non-family households | 1,084 | 6.4% | Percent of all households |
| P018018 | Households, total count of non-family male headed households | 632 | 3.7% | Percent of all households |
| P018019 | Households, total count of non-family female headed households | 452 | 2.7% | Percent of all households |
| P019001 | Households, total count | 16,960 | 100.0% | All households |
| P019002 | Households, total count of those with children under 18 | 5,895 | 34.8% | Percent of all households |
| P019003 | Households, total count of family households, with children under 18 | 5,829 | 34.4% | Percent of all households |
| P019004 | Households, total count of married family households, with children under 18 | 4,282 | 25.2% | Percent of all households |
| P019005 | Households, total count of other (non-married) family households, with children under 18 | 1,547 | 9.1% | Percent of all households |
| P019006 | Households, count of male headed family households, with children under 18 | 376 | 2.2% | Percent of all households |
| P019007 | Households, count of female family households, with children under 18 | 1,171 | 6.9% | Percent of all households |
| P019008 | Households, total count of non-family households, with children under 18 | 66 | 0.4% | Percent of all households |
| P019009 | Households, count of male headed non-family households, with children under 18 | 53 | 0.3% | Percent of all households |
| P019010 | Households, count of female non-family households, with children under 18 | 13 | 0.1% | Percent of all households |
| P019011 | Households, total count of those with no children under 18 | 11,065 | 65.2% | Percent of all households |
| P019012 | Households, total count of family households, with no children under 18 | 5,532 | 32.6% | Percent of all households |
| P019013 | Households, total count of married family households, with no children under 18 | 4,831 | 28.5% | Percent of all households |
| P019014 | Households, total count of other (non-married) family households, with no children under 18 | 701 | 4.1% | Percent of all households |
| P019015 | Households, count of male headed family households, with no children under 18 | 226 | 1.3% | Percent of all households |
| P019016 | Households, count of female family households, with no children under 18 | 475 | 2.8% | Percent of all households |
| P019017 | Households, total count of non-family households, with no children under 18 | 5,533 | 32.6% | Percent of all households |
| P019018 | Households, count of male headed non-family households, with no children under 18 | 2,597 | 15.3% | Percent of all households |
| P019019 | Households, count of female non-family households, with no children under 18 | 2,936 | 17.3% | Percent of all households |
| P020017 | Households, total count of those with householder age 65 or greater | 2,709 | 16.0% | Percent of all households |
| P020018 | Households, total count of those with householder age 65 or greater - family households | 1,574 | 9.3% | Percent of all households |
| P020019 | Households, total count of those with householder age 65 or greater - married couple family | 1,358 | 8.0% | Percent of all households |
| P020020 | Households, count of householders age 65 or greater - married couple with children under 18 | 9 | 0.1% | Percent of all households |
| P020021 | Count of householders age 65 or greater - married couple family with no children under 18 | 1,349 | 8.0% | Percent of all households |
| P020022 | Households, count of those with householder age 65 or greater - other (non-married) family | 216 | 1.3% | Percent of all households |
| P020023 | Households, total count of male householders age 65+, no wife present | 55 | 0.3% | Percent of all households |
| P020024 | Households, total count of male householders age 65+, no wife, with children under 18 | 0 | 0.0% | Percent of all households |
| P020025 | Households, total count of male householders age 65+, no wife, with no children under 18 | 55 | 0.3% | Percent of all households |
| P020026 | Households, total count of female householders age 65+, no husband present | 161 | 0.9% | Percent of all households |
| P020027 | Households, total count of female householders age 65+, no husband, with children under 18 | 2 | 0.0% | Percent of all households |
| P020028 | Households, count of female householders age 65+, no husband, with no children under 18 | 159 | 0.9% | Percent of all households |
| P020029 | Households, total count of those with householder age 65 or greater, non-family household | 1,135 | 6.7% | Percent of all households |
| P020030 | Households, count of householders age 65 or greater, living alone | 1,102 | 6.5% | Percent of all households |
| P020031 | Households, count of householders age 65 or greater, non-family households, not living alone | 33 | 0.2% | Percent of all households |
| P021001 | Households, total count | 16,960 | 100.0% | All households |
| P021002 | Households, total count of family households | 11,361 | 67.0% | Percent of all households |
| P021003 | Households, total count of family households, householder 15 to 24 years old | 439 | 2.6% | Percent of all households |
| P021004 | Households, total count of family households, householder 25 to 34 years old | 2,210 | 13.0% | Percent of all households |
| P021005 | Households, total count of family households, householder 35 to 44 years old | 2,942 | 17.3% | Percent of all households |
| P021006 | Households, total count of family households, householder 45 to 54 years old | 2,669 | 15.7% | Percent of all households |
| P021007 | Households, total count of family households, householder 55 to 64 years old | 1,527 | 9.0% | Percent of all households |
| P021008 | Households, total count of family households, householder 65 to 74 years old | 1,041 | 6.1% | Percent of all households |
| P021009 | Households, total count of family households, householder 75 to 84 years old | 472 | 2.8% | Percent of all households |
| P021010 | Households, total count of family households, householder 85 years old & over | 61 | 0.4% | Percent of all households |
| P021011 | Households, total count of non-family households | 5,599 | 33.0% | Percent of all households |
| P021012 | Households, total count of non-family households, householder 15 to 24 years old | 675 | 4.0% | Percent of all households |
| P021013 | Households, total count of non-family households, householder 25 to 34 years old | 1,325 | 7.8% | Percent of all households |
| P021014 | Households, total count of non-family households, householder 35 to 44 years old | 903 | 5.3% | Percent of all households |
| P021015 | Households, total count of non-family households, householder 45 to 54 years old | 916 | 5.4% | Percent of all households |
| P021016 | Households, total count of non-family households, householder 55 to 64 years old | 645 | 3.8% | Percent of all households |
| P021017 | Households, total count of non-family households, householder 65 to 74 years old | 518 | 3.1% | Percent of all households |
| P021018 | Households, total count of non-family households, householder 75 to 84 years old | 481 | 2.8% | Percent of all households |
| P021019 | Households, total count of non-family households, householder 85 years old & over | 136 | 0.8% | Percent of all households |
| P022001 | Households, total count | 16,960 | 100.0% | All households |
| P022002 | Households, total count households with one or more people age 60 & over | 4,017 | 23.7% | Percent of all households |
| P022003 | Households, total count 1 person households with one person age 60 & over | 1,399 | 8.2% | Percent of all households |
| P022004 | Households, count households with 2+ residents, with 1+ people age 60 & over | 2,618 | 15.4% | Percent of all households |
| P022005 | Households, count of family households with one or more people age 60 & over | 2,553 | 15.1% | Percent of all households |
| P022006 | Households, count of non-family households with one or more people age 60 & over | 65 | 0.4% | Percent of all households |
| P022007 | Households, total count households with no people age 60 & over | 12,943 | 76.3% | Percent of all households |
| P022008 | Households, total count 1 person households with no people age 60 & over | 3,116 | 18.4% | Percent of all households |
| P022009 | Households, count households with 2+ residents, with no people age 60 & over | 9,827 | 57.9% | Percent of all households |
| P022010 | Households, count of family households with no people age 60 & over | 8,808 | 51.9% | Percent of all households |
| P022011 | Households, count of non-family households with no people age 60 & over | 1,019 | 6.0% | Percent of all households |
| P023001 | Households, total count | 16,960 | 100.0% | All households |
| P024002 | Households, total count households with one or more people age 75 & over | 1,353 | 8.0% | Percent of all households |
| P024003 | Households, total count 1 person households with one person age 75 & over | 607 | 3.6% | Percent of all households |
| P024004 | Households, count households with 2+ residents, with 1+ people age 75 & over | 746 | 4.4% | Percent of all households |
| P024005 | Households, count of family households with one or more people age 75 & over | 731 | 4.3% | Percent of all households |
| P024006 | Households, count of non-family households with one or more people age 75 & over | 15 | 0.1% | Percent of all households |
| P024007 | Households, total count households with no people age 75 & over | 15,607 | 92.0% | Percent of all households |
| P024008 | Households, total count 1 person households with no people age 75 & over | 3,908 | 23.0% | Percent of all households |
| P024009 | Households, count households with 2+ residents, with no people age 75 & over | 11,699 | 69.0% | Percent of all households |
| P024010 | Households, count of family households with no people age 75 & over | 10,630 | 62.7% | Percent of all households |
| P024011 | Households, count of non-family households with no people age 75 & over | 1,069 | 6.3% | Percent of all households |
| P025001 | Households, total count | 16,960 | 100.0% | All households |
| P025002 | Households, count of households with one or more nonrelative residents | 1,611 | 9.5% | Percent of all households |
| P025003 | Households, count of households with no nonrelative residents | 15,349 | 90.5% | Percent of all households |
| P026001 | Households, total count | 16,960 | 100.0% | All households |
| P026002 | Households, total count of family households | 11,361 | 67.0% | Percent of all households |
| P026003 | Households, total count of 2 person family households | 4,900 | 28.9% | Percent of all households |
| P026004 | Households, total count of 3 person family households | 2,840 | 16.7% | Percent of all households |
| P026005 | Households, total count of 3 person family households | 2,347 | 13.8% | Percent of all households |
| P026006 | Households, total count of 5 person family households | 921 | 5.4% | Percent of all households |
| P026007 | Households, total count of 6 person family households | 267 | 1.6% | Percent of all households |
| P026008 | Households, total count of 7 or more person family households | 86 | 0.5% | Percent of all households |
| P026009 | Households, total count of non-family households | 5,599 | 33.0% | Percent of all households |
| P026010 | Households, total count of 1 person non-family households | 4,515 | 26.6% | Percent of all households |
| P026011 | Households, total count of 2 person non-family households | 934 | 5.5% | Percent of all households |
| P026012 | Households, total count of 3 person non-family households | 105 | 0.6% | Percent of all households |
| P026013 | Households, total count of 3 person non-family households | 37 | 0.2% | Percent of all households |
| P026014 | Households, total count of 5 person non-family households | 6 | 0.0% | Percent of all households |
| P026015 | Households, total count of 6 person non-family households | 2 | 0.0% | Percent of all households |
| P026016 | Households, total count of 7 or more person non-family households | 0 | 0.0% | Percent of all households |
| P026A001 | Households, total count of households with White householder | 15,381 | 90.7% | Percent of all households |
| P026A002 | Households, total count of family households with White householder | 10,320 | 60.8% | Percent of all households |
| P026A009 | Households, total count of non-family households with White householder | 5,061 | 29.8% | Percent of all households |
| P026B001 | Households, total count of households with Black householder | 1,015 | 6.0% | Percent of all households |
| P026B002 | Households, total count of family households with Black householder | 658 | 3.9% | Percent of all households |
| P026B009 | Households, total count of non-family households with Black householder | 357 | 2.1% | Percent of all households |
| P026C001 | Households, total count of households with American Indian householder | 24 | 0.1% | Percent of all households |
| P026C002 | Households, total count of family households with American Indian householder | 17 | 0.1% | Percent of all households |
| P026C009 | Households, total count of non-family households with American Indian householder | 7 | 0.0% | Percent of all households |
| P026D001 | Households, total count of households with Asian householder | 349 | 2.1% | Percent of all households |
| P026D002 | Households, total count of family households with Asian householder | 243 | 1.4% | Percent of all households |
| P026D009 | Households, total count of non-family households with Asian householder | 106 | 0.6% | Percent of all households |
| P026E001 | Households, total count of households with Native Hawaiian / Pacific Islander householder | 4 | 0.0% | Percent of all households |
| P026E002 | Households, count of family HH with Native Hawaiian / Pacific Islander householder | 1 | 0.0% | Percent of all households |
| P026E009 | Households, count of non-family HH with Native Hawaiian / Pacific Islander householder | 3 | 0.0% | Percent of all households |
| P026F001 | Households, total count of households with Other Race householder | 63 | 0.4% | Percent of all households |
| P026F002 | Households, total count of family households with Other Race householder | 42 | 0.2% | Percent of all households |
| P026F009 | Households, total count of non-family households with Other Race householder | 21 | 0.1% | Percent of all households |
| P026G001 | Households, total count of households with householder listing 2 or more races | 124 | 0.7% | Percent of all households |
| P026G002 | Households, total count of family households with householder listing 2 or more races | 80 | 0.5% | Percent of all households |
| P026G009 | Households, total count of non-family households with householder listing 2 or more races | 44 | 0.3% | Percent of all households |
| P026H001 | Households, total count of households with Hispanic householder | 195 | 1.1% | Percent of all households |
| P026H002 | Households, total count of family households with Hispanic householder | 132 | 0.8% | Percent of all households |
| P026H009 | Households, total count of non-family households with Hispanic householder | 63 | 0.4% | Percent of all households |