Census tract · Johnson County
Census Tract 9778, Johnson County, Illinois
Census Tract 9778, GEOID 17087977800, in Johnson County, Illinois, partly within Vienna, Cypress and Belknap. 4,152 residents in the ACS 2020-2024 5-year estimates (±439); the 2020 Census counted 3,462.
Residents, 2020-2024
4,152
±439 (90% margin)
2020 Census count: 3,462
Median household income
$52,237
±$16,652 (90% margin)
Johnson County: $62,528
Median home value
$112,100
±$20,850 (90% margin)
Johnson County: $160,500
Median gross rent
$674
±$105 (90% margin)
Johnson County: $781
Where is Census Tract 9778?
Census Tract 9778 is one of 4 census tracts in Johnson County, Illinois. It covers 120.48 square miles of land, 29 residents per square mile in 2020. Its GEOID, 17087977800, names it uniquely (how tract numbers and GEOIDs work).
7 census tracts border Census Tract 9778: Tract 9776 ($69,289), Tract 9777 ($66,250), Tract 9800*, Tract 9701 in Massac County ($76,414), Tract 9713 in Pope County ($57,024), Tract 9710 in Pulaski County ($52,632) and Tract 9505 in Union County ($73,906). The figure in brackets is each tract's median household income; * a special land-use tract (water, a park or an institution) with few or no residents.
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 9778?
The 2020-2024 American Community Survey puts Census Tract 9778's population at 4,152 (±439) in 1,398 households; the 2020 Census counted 3,462 residents and 1,679 housing units.
| Measure | Tract 9778 | Johnson County |
|---|---|---|
| Total population | 4,152 ±439 | 13,376 |
| Households | 1,398 ±120 | 4,101 |
| Average household size | 2.93 ±0.31 | 2.82 |
| Housing units | 1,634 ±107 | 5,541 |
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 9778?
The median resident of Census Tract 9778 is 36.3 years old; 23.2% are under 18 and 18.7% are 65 or older. The largest group is non-Hispanic white residents at 79.5%, then non-Hispanic residents of two or more races at 11.5%.
| Measure | Tract 9778 | Johnson County |
|---|---|---|
| Median age | 36.3 ±6.7 | 41.4 |
| Under 18 years | 23.2% ±3.2 pts | 18.6% |
| 65 years and over | 18.7% ±2.6 pts | 19.7% |
| Hispanic or Latino (any race) | 5.4% ±3.4 pts | 4.5% |
| White alone, not Hispanic | 79.5% ±6.8 pts | 80.1% |
| Black or African American alone, not Hispanic | 3.4% ±3.5 pts | 7.8% |
| Asian alone, not Hispanic | 0.2% ±0.4 pts | 0.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Two or more races, not Hispanic | 11.5% ±6.9 pts | 7.2% |
| Some other race alone, not Hispanic | 0.0% ±0.9 pts | 0.2% |
| Born outside the United States | 0.7% ±0.7 pts | 1.2% |
| Speak a language other than English at home (age 5+) | 0.2% ±0.2 pts | 2.3% |
| Civilian veterans (age 18+) | 6.6% ±2.2 pts | 8.1% |
| With a disability | 18.6% ±3.1 pts | 18.6% |
| No health insurance coverage | 11.5% ±6.7 pts | 8.1% |
| High school graduate or higher (age 25+) | 89.2% ±2.6 pts | 85.4% |
| Bachelor's degree or higher (age 25+) | 15.8% ±4.6 pts | 19.6% |
| Graduate or professional degree (age 25+) | 3.4% ±1.3 pts | 7.6% |
| Lived in the same house a year earlier | 86.4% ±5.9 pts | 84.0% |
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 9778 earn?
Half of the 1,398 households in Census Tract 9778 earn less than $52,237 a year (±$16,652), against $62,528 across Johnson County: 3rd highest of the county's 3 tracts with a reliable estimate. 27.3% of residents live below the poverty line.
| Measure | Tract 9778 | Johnson County |
|---|---|---|
| Median household income | $52,237 ±$16,652 | $62,528 |
| Mean household income | $62,181 ±$6,429 | $78,647 |
| Per capita income | $25,827 ±$3,197 | $27,765 |
| People below the poverty line | 27.3% ±7.1 pts | 17.6% |
| Children under 18 below the poverty line | 27.2% ±12.0 pts | 22.4% |
| Households receiving SNAP | 23.5% ±6.0 pts | 12.9% |
| Households with a computer | 85.8% ±3.5 pts | 88.0% |
| Households with a broadband subscription | 77.8% ±4.8 pts | 80.1% |
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 9778?
Owners occupy 67.5% of Census Tract 9778's occupied homes and renters 32.5%. The median owner-occupied home is valued at $112,100 by its owner (±$20,850). The median renter pays $674 a month including utilities, and 46.5% of renters pay 35% or more of their income on rent.
| Measure | Tract 9778 | Johnson County |
|---|---|---|
| Median home value (owner-occupied) | $112,100 ±$20,850 | $160,500 |
| Median gross rent | $674 ±$105 | $781 |
| Renters paying 35% or more of income on rent | 46.5% ±18.0 pts | 34.3% |
| Median monthly owner costs, with a mortgage | $1,174 ±$245 | $1,510 |
| Owner-occupied homes | 67.5% ±8.3 pts | 82.0% |
| Renter-occupied homes | 32.5% ±8.3 pts | 18.0% |
| Housing units | 1,634 ±107 | 5,541 |
| Single-family detached homes | 58.0% ±6.3 pts | 66.4% |
| Mobile homes | 27.4% ±6.7 pts | 26.5% |
| Built 2020 or later | 1.1% ±1.2 pts | 0.7% |
| Built 2010 to 2019 | 6.9% ±3.5 pts | 10.1% |
| Built 1939 or earlier | 9.7% ±3.9 pts | 5.4% |
| Households with no vehicle | 9.2% ±3.1 pts | 4.3% |
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 9778 get to work?
84.6% of Census Tract 9778's workers drive alone. The average trip to work takes 28.4 minutes. The unemployment rate in 2020-2024 averaged 2.3%.
| Measure | Tract 9778 | Johnson County |
|---|---|---|
| In the labor force (age 16+) | 48.8% ±6.2 pts | 42.0% |
| Unemployment rate | 2.3% ±1.4 pts | 3.5% |
| Drove alone to work | 84.6% ±6.1 pts | 84.8% |
| Carpooled | 7.0% ±4.0 pts | 8.1% |
| Public transportation | 0.1% ±0.3 pts | 0.0% |
| Walked | 0.2% ±0.3 pts | 0.9% |
| Worked from home | 7.4% ±5.1 pts | 4.8% |
| Mean travel time to work | 28.4 min ±5.6 | 28.4 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 9778 compare with the other tracts in Johnson County?
Among Johnson County's tracts with a reliable estimate, Census Tract 9778 ranks as shown below (1 = highest).
| Measure | In Johnson County |
|---|---|
| Population | 2nd of 4 |
| Residents per square mile | 4th of 4 |
| Median household income | 3rd of 3 |
| Per capita income | 3rd of 3 |
| Median home value | 2nd of 3 |
| Median gross rent | 3rd of 3 |
| Poverty rate | 1st of 3 |
| Bachelor's degree or higher | 3rd of 3 |
| Median age | 4th of 4 |
| Owner-occupied share | 3rd of 3 |
The tracts next to it on Johnson County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 9776 | 1st | $69,289±$9,345 · within the margin of this tract |
| Tract 9777 | 2nd | $66,250±$8,854 · within the margin of this tract |
| Tract 9778 | 3rd | $52,237±$16,652 |
"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 9778?
3 of the 18 figures for Census Tract 9778 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.
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