Census tracts · Alton, IL

Census tracts in Alton, Illinois

10 census tracts lie mostly within Alton, and 5 more reach into it, by the 2020 census blocks they share. Median household income runs from $37,063 in Tract 4026 to $76,479 in Tract 4023, against $54,568 for Alton as a whole (ACS 2020-2024 5-year estimates).

Which census tracts of Alton earn the most and the least?

The five tracts with the highest and the lowest median household income among those mostly within Alton and with a reliable estimate.

Tract 4023 $76,479
Tract 4025 $68,750
Tract 4022 $63,730
Tract 4015 $63,385
Tract 4014 $59,298
Tract 4020 $55,104
Tract 4017.01 $45,843
Tract 4024 $39,531
Tract 4021 $38,688
Tract 4026 $37,063

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

Every census tract in Alton

Sort by any column; the share column is how much of each tract's land (by 2020 census blocks) lies inside Alton.

Census tracts in or partly in Alton, ACS 2020-2024 5-year estimates. Distance and direction from the Census Bureau's internal point of Alton (2024 Gazetteer), which is not always its downtown

Tract 402117119402100	1.1 mi west	Madison County	2,092±313	$38,688	$100,600	$912	100%
Tract 402517119402500	1.2 mi southwest	Madison County	1,665±299	$68,750	$134,100	$1,096	100%
Tract 402617119402600	0.7 mi south	Madison County	2,517±448	$37,063	$68,400	$956	100%
Tract 402217119402200	2.1 mi west	Madison County	2,942±461	$63,730	$114,100	$1,056	99%
Tract 401517119401500	1.4 mi southeast	Madison County	2,670±598	$63,385	$79,800	$1,227	98%
Tract 402017119402000	0.6 mi north	Madison County	4,303±580	$55,104	$117,800	$971	98%
Tract 402317119402300	2.5 mi west	Madison County	1,923±320	$76,479	$124,000	$1,053	94%
Tract 401417119401400	1.3 mi southeast	Madison County	3,415±421	$59,298	$95,500	$880	94%
Tract 402417119402400	1.6 mi south	Madison County	1,707±305	$39,531	$112,100	$873	90%
Tract 4017.0117119401701	2.8 mi east	Madison County	2,376±378	$45,843	$43,600	$1,079	51%
Tract 4028.0117119402801	4.4 mi north	Madison County	3,576±371	$105,938	$243,300	not published	19%
Tract 4027.0117119402701	4.3 mi north	Madison County	6,519±518	$69,044	$162,500	$817	18%
Tract 4028.0417119402804	8.4 mi northeast	Madison County	2,242±352	$104,375	$238,500	$1,510	3%
Tract 4027.2217119402722	4.9 mi west	Madison County	2,810±349	$105,821	$213,000	$1,464	2%
Tract 401317119401300	2.8 mi southeast	Madison County	4,582±452	$48,299	$99,500	$909	2%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files · Census block assignment files

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections