City · Kentucky
Northfield, Kentucky
Northfield, city, in Jefferson County, Kentucky. Northfield had 1,015 residents on July 1, 2025 by the Census Bureau's estimate, up 1.9% since 2020; the 2020 Census counted 991 and the ACS 2020-2024 5-year estimates put it at 1,250 (±324). GEOID 2156730.
Residents, July 2025 estimate
1,015
Census Bureau estimate (no margin published)
2020 Census count: 991 · ACS 2020-2024: 1,250 ±324
Median household income
$111,250
±$38,880 (90% margin)
Kentucky: $63,726
Median home value
$513,300
±$95,820 (90% margin)
Kentucky: $205,600
Median gross rent
$1,659
±$250 (90% margin)
Kentucky: $967
Where is Northfield and what county is it in?
Northfield is a city in Jefferson County, Kentucky. It covers 0.5 square miles of land, 2,104 residents per square mile in 2020.
Northfield is in the Louisville/Jefferson County, KY-IN metropolitan statistical area, which takes in 12 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Northfield, and is it growing?
The Census Bureau estimates that 1,015 people lived in Northfield on July 1, 2025, up 1.9% since 2020, in line with Kentucky (+2.2%). The 2020 Census counted 991 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,250 (±324).
| Measure | Northfield | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,250 ±324 | 783,022 | no clear change |
| Households | 528 ±138 | 331,554 | no clear change |
| Average household size | 2.27 ±0.29 | 2.32 | no clear change |
| Housing units | 594 ±147 | 359,710 | no clear change |
Northfield's population since 2000
From 970 in 2000 to 1,015 in 2025: up 4.6%. The 2000, 2010 and 2020 figures are census counts, each for Northfield as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Northfield?
The median resident of Northfield is 46.6 years old; 24.2% are under 18 and 22.5% are 65 or older. The largest group is non-Hispanic white residents at 85.5%, then Hispanic or Latino residents (of any race) at 4.6%.
| Measure | Northfield | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 46.6 ±10.7 | 38.4 | no clear change |
| Under 18 years | 24.2% ±7.5 pts | 22.3% | – |
| 65 years and over | 22.5% ±8.3 pts | 17.2% | – |
| Male | 47.7% ±5.3 pts | 48.7% | – |
| Hispanic or Latino (any race) | 4.6% ±5.3 pts | 8.6% | – |
| White alone, not Hispanic | 85.5% ±6.7 pts | 62.0% | no clear change |
| Black or African American alone, not Hispanic | 4.1% ±3.4 pts | 20.6% | – |
| Asian alone, not Hispanic | 2.6% ±2.3 pts | 3.1% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.4% ±0.6 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±3.0 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.9% ±1.7 pts | 5.2% | – |
| Some other race alone, not Hispanic | 0.0% ±3.0 pts | 0.4% | – |
| Born outside the United States | 7.1% ±5.0 pts | 10.0% | – |
| Speak a language other than English at home (age 5+) | 5.6% ±5.0 pts | 12.9% | – |
| Civilian veterans (age 18+) | 6.4% ±4.0 pts | 6.2% | – |
| With a disability | 10.6% ±5.0 pts | 14.4% | – |
| No health insurance coverage | 4.2% ±5.3 pts | 5.7% | – |
| High school graduate or higher (age 25+) | 96.1% ±4.0 pts | 91.3% | – |
| Bachelor's degree or higher (age 25+) | 69.4% ±10.8 pts | 37.0% | no clear change |
| Graduate or professional degree (age 25+) | 26.8% ±10.0 pts | 15.5% | – |
| Lived in the same house a year earlier | 78.6% ±8.6 pts | 86.4% | – |
| Moved from another state in the past year | 3.5% ±2.9 pts | 2.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Northfield earn?
Half of Northfield's 528 households earn less than $111,250 a year (±$38,880), against $69,866 in Jefferson County and $63,726 in Kentucky. In 2015-2019 it was $132,984 in 2024 dollars; the margins of error cannot tell the two periods apart. 10.5% of residents live below the poverty line.
| Measure | Northfield | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $111,250 ±$38,880 | $69,866 | no clear change |
| Mean household income | $148,017 ±$35,376 | $97,866 | – |
| Per capita income | $69,017 ±$12,815 | $42,087 | no clear change |
| People below the poverty line | 10.5% ±5.6 pts | 14.3% | +6.4 pts |
| Children under 18 below the poverty line | 11.4% ±14.7 pts | 19.8% | – |
| Households receiving SNAP | 0.4% ±0.9 pts | 11.0% | – |
| Households with a computer | 91.5% ±8.4 pts | 94.9% | – |
| Households with a broadband subscription | 79.7% ±9.9 pts | 90.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Northfield?
Owners occupy 59.7% of Northfield's occupied homes and renters 40.3%. The median owner-occupied home is valued at $513,300 by its owner (±$95,820). The median renter pays $1,659 a month including utilities, and 53.3% of renters pay 35% or more of their income on rent.
| Measure | Northfield | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $513,300 ±$95,820 | $248,400 | no clear change |
| Median gross rent | $1,659 ±$250 | $1,149 | no clear change |
| Renters paying 35% or more of income on rent | 53.3% ±15.3 pts | 38.5% | +23.8 pts |
| Median monthly owner costs, with a mortgage | $2,757 ±$212 | $1,593 | – |
| Owner-occupied homes | 59.7% ±12.7 pts | 62.1% | −15.6 pts |
| Renter-occupied homes | 40.3% ±12.7 pts | 37.9% | – |
| Housing units | 594 ±147 | 359,710 | no clear change |
| Homeowner vacancy rate | 0.9% ±1.9 pts | 0.9% | – |
| Rental vacancy rate | 22.8% ±30.6 pts | 6.3% | – |
| Single-family detached homes | 53.5% ±13.8 pts | 64.0% | – |
| Mobile homes | 0.0% ±6.1 pts | 1.2% | – |
| Built 2020 or later | 13.6% ±15.7 pts | 1.5% | – |
| Built 2010 to 2019 | 4.2% ±4.3 pts | 7.7% | – |
| Built 1939 or earlier | 0.0% ±6.1 pts | 13.5% | – |
| Households with no vehicle | 12.9% ±8.5 pts | 8.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Northfield work and get to work?
55.2% of Northfield's workers drive alone and 36.7% work from home. The average trip to work takes 18.5 minutes.
| Measure | Northfield | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 56.4% ±6.6 pts | 65.5% | – |
| Unemployment rate | 0.5% ±0.8 pts | 5.2% | – |
| Drove alone to work | 55.2% ±16.6 pts | 72.4% | – |
| Carpooled | 8.0% ±4.7 pts | 8.4% | – |
| Public transportation | 0.0% ±6.6 pts | 1.5% | – |
| Walked | 0.0% ±6.6 pts | 1.7% | – |
| Worked from home | 36.7% ±18.3 pts | 14.2% | +28.8 pts |
| Mean travel time to work | 18.5 min ±1.6 | 22.2 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Northfield?
No census tract lies mostly in Northfield; 4 tracts reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 75.02Jefferson County | 5,782 | $137,813 |
| Tract 103.18Jefferson County | 5,366 | $111,180 |
| Tract 100.07Jefferson County | 4,295 | $102,000 |
| Tract 75.01Jefferson County | 6,374 | $172,315 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Northfield) · Census block assignment files
How does Northfield compare with other places in Kentucky?
By the Census Bureau's July 2025 estimates, Northfield is the 10,196th-most populous of the 19,476 U.S. incorporated places that have one and the 204th-most populous of 418 in Kentucky.
Northfield is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 204th | 418 |
Northfield's figures with every place in Kentucky (CSV)
Every place in Kentucky, sortable · Compare Northfield with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Northfield?
22 of the 57 figures for Northfield on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Northfield are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Northfield.