Census tract · Johnson County
Census Tract 4.01, Johnson County, Iowa
Census Tract 4.01, GEOID 19103000401, in Johnson County, Iowa, mostly within Iowa City (95% of its census blocks). 3,133 residents in the ACS 2020-2024 5-year estimates (±600); the 2020 Census counted 3,519.
Residents, 2020-2024
3,133
±600 (90% margin)
2020 Census count: 3,519
Median household income
$63,132
±$14,836 (90% margin)
Johnson County: $74,935
Median home value
$265,600
±$26,271 (90% margin)
Johnson County: $308,600
Median gross rent
$1,072
±$135 (90% margin)
Johnson County: $1,122
Where is Census Tract 4.01?
Census Tract 4.01 is one of 36 census tracts in Johnson County, Iowa. It covers 0.54 square miles of land, 6,505 residents per square mile in 2020. Its GEOID, 19103000401, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Iowa City | 95% |
3 census tracts border Census Tract 4.01: Tract 4.02 ($126,619), Tract 5.01 ($66,827) and Tract 5.02 ($56,250). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 4.01?
The 2020-2024 American Community Survey puts Census Tract 4.01's population at 3,133 (±600) in 1,256 households; the 2020 Census counted 3,519 residents and 1,507 housing units.
| Measure | Tract 4.01 | Iowa City |
|---|---|---|
| Total population | 3,133 ±600 | 75,752 |
| Households | 1,256 ±212 | 30,816 |
| Average household size | 2.45 ±0.22 | 2.24 |
| Housing units | 1,417 ±204 | 33,863 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 4.01?
The median resident of Census Tract 4.01 is 30.3 years old; 26.7% are under 18 and 9.5% are 65 or older. The largest group is non-Hispanic white residents at 44.2%, then non-Hispanic Black residents at 28.4%. 25.9% of residents were born outside the United States.
| Measure | Tract 4.01 | Iowa City |
|---|---|---|
| Median age | 30.3 ±7.3 | 26.2 |
| Under 18 years | 26.7% ±6.3 pts | 14.3% |
| 65 years and over | 9.5% ±2.8 pts | 12.3% |
| Hispanic or Latino (any race) | 5.8% ±5.1 pts | 8.1% |
| White alone, not Hispanic | 44.2% ±11.8 pts | 70.4% |
| Black or African American alone, not Hispanic | 28.4% ±9.0 pts | 9.4% |
| Asian alone, not Hispanic | 18.8% ±8.5 pts | 7.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Two or more races, not Hispanic | 2.4% ±2.4 pts | 4.3% |
| Some other race alone, not Hispanic | 0.4% ±0.7 pts | 0.7% |
| Born outside the United States | 25.9% ±7.5 pts | 12.2% |
| Speak a language other than English at home (age 5+) | 41.3% ±13.5 pts | 18.2% |
| Civilian veterans (age 18+) | 1.5% ±1.3 pts | 3.4% |
| With a disability | 6.7% ±4.0 pts | 11.0% |
| No health insurance coverage | 10.9% ±4.2 pts | 4.5% |
| High school graduate or higher (age 25+) | 89.8% ±7.6 pts | 96.5% |
| Bachelor's degree or higher (age 25+) | 43.7% ±11.7 pts | 60.5% |
| Graduate or professional degree (age 25+) | 23.7% ±10.2 pts | 29.8% |
| Lived in the same house a year earlier | 92.1% ±4.5 pts | 68.7% |
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 Census Tract 4.01 earn?
Half of the 1,256 households in Census Tract 4.01 earn less than $63,132 a year (±$14,836), against $74,935 across Johnson County: 24th highest of the county's 36 tracts with a reliable estimate. 30.2% of residents live below the poverty line.
| Measure | Tract 4.01 | Iowa City |
|---|---|---|
| Median household income | $63,132 ±$14,836 | $58,546 |
| Mean household income | $81,663 ±$18,173 | $90,456 |
| Per capita income | $34,062 ±$7,186 | $37,842 |
| People below the poverty line | 30.2% ±13.5 pts | 26.3% |
| Children under 18 below the poverty line | 35.2% ±25.8 pts | 14.2% |
| Households receiving SNAP | 15.5% ±6.8 pts | 7.0% |
| Households with a computer | 97.3% ±2.6 pts | 97.5% |
| Households with a broadband subscription | 84.6% ±7.8 pts | 86.1% |
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 Census Tract 4.01?
Owners occupy 52.1% of Census Tract 4.01's occupied homes and renters 47.9%. The median owner-occupied home is valued at $265,600 by its owner (±$26,271). The median renter pays $1,072 a month including utilities, and 46.2% of renters pay 35% or more of their income on rent.
| Measure | Tract 4.01 | Iowa City |
|---|---|---|
| Median home value (owner-occupied) | $265,600 ±$26,271 | $285,900 |
| Median gross rent | $1,072 ±$135 | $1,094 |
| Renters paying 35% or more of income on rent | 46.2% ±17.0 pts | 52.1% |
| Median monthly owner costs, with a mortgage | $1,734 ±$858 | $1,813 |
| Owner-occupied homes | 52.1% ±10.1 pts | 47.2% |
| Renter-occupied homes | 47.9% ±10.1 pts | 52.8% |
| Housing units | 1,417 ±204 | 33,863 |
| Single-family detached homes | 31.3% ±8.6 pts | 39.8% |
| Mobile homes | 0.0% ±1.7 pts | 2.1% |
| Built 2020 or later | 0.0% ±1.7 pts | 2.1% |
| Built 2010 to 2019 | 7.9% ±4.9 pts | 16.4% |
| Built 1939 or earlier | 1.0% ±1.5 pts | 11.8% |
| Households with no vehicle | 10.7% ±8.5 pts | 11.0% |
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 Census Tract 4.01 get to work?
69.4% of Census Tract 4.01's workers drive alone and 10.2% work from home. The average trip to work takes 32.6 minutes.
| Measure | Tract 4.01 | Iowa City |
|---|---|---|
| In the labor force (age 16+) | 75.3% ±5.3 pts | 68.4% |
| Unemployment rate | 2.0% ±2.2 pts | 4.6% |
| Drove alone to work | 69.4% ±11.5 pts | 56.2% |
| Carpooled | 10.5% ±5.5 pts | 6.7% |
| Public transportation | 4.8% ±3.5 pts | 6.0% |
| Walked | 0.0% ±1.5 pts | 14.6% |
| Worked from home | 10.2% ±6.1 pts | 12.2% |
| Mean travel time to work | 32.6 min ±13.7 | 17.3 min |
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
How does Census Tract 4.01 compare with the other tracts in Johnson County?
Among Johnson County's tracts with a reliable estimate, Census Tract 4.01 ranks as shown below (1 = highest).
| Measure | In Johnson County | In Iowa City |
|---|---|---|
| Population | 27th of 36 | 16th of 19 |
| Residents per square mile | 6th of 36 | 6th of 19 |
| Median household income | 24th of 36 | 11th of 19 |
| Per capita income | 26th of 36 | 12th of 19 |
| Median home value | 23rd of 35 | 12th of 18 |
| Median gross rent | 24th of 36 | 11th of 19 |
| Poverty rate | 8th of 28 | 6th of 18 |
| Bachelor's degree or higher | 28th of 36 | 15th of 19 |
| Median age | 25th of 36 | 12th of 19 |
| Owner-occupied share | 25th of 34 | 12th of 17 |
The tracts next to it on Johnson County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 23 | 21st | $69,118±$22,092 · within the margin of this tract |
| Tract 18.02 | 22nd | $68,750±$15,054 · within the margin of this tract |
| Tract 5.01 | 23rd | $66,827±$11,729 · within the margin of this tract |
| Tract 4.01 | 24th | $63,132±$14,836 |
| Tract 3.03 | 25th | $61,319±$12,519 · within the margin of this tract |
| Tract 17 | 26th | $59,458±$9,465 · within the margin of this tract |
| Tract 104.01 | 27th | $58,318±$3,456 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 4.01?
1 of the 18 figures for Census Tract 4.01 on this page carries a coefficient of variation over 40% and is marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). 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 · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections