Census tracts · O'Fallon, MO

Census tracts in O'Fallon, Missouri

18 census tracts lie mostly within O'Fallon, and 12 more reach into it, by the 2020 census blocks they share. Median household income runs from $65,052 in Tract 3119.07 to $165,417 in Tract 3122.09, against $110,443 for O'Fallon as a whole (ACS 2020-2024 5-year estimates).

Which census tracts of O'Fallon earn the most and the least?

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

Tract 3122.09 $165,417
Tract 3117.35 $149,625
Tract 3122.08 $142,841
Tract 3117.39 $139,487
Tract 3111.54 $133,013
Tract 3117.33 $88,672
Tract 3118.02 $88,320
Tract 3116.02 $86,426
Tract 3116.03 $82,840
Tract 3119.07 $65,052

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 O'Fallon

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

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

Tract 3116.0229183311602	3.0 mi northeast	St. Charles County	5,476±650	$86,426	$257,200	$1,403	97%
Tract 3117.3729183311737	0.6 mi southwest	St. Charles County	2,832±231	$117,422	$380,600	$828	96%
Tract 3116.0329183311603	3.6 mi northeast	St. Charles County	3,271±730	$82,840	$272,300	$1,106	92%
Tract 3116.0429183311604	3.8 mi northeast	St. Charles County	3,101±458	$98,403	$340,400	$860	85%
Tract 3111.5329183311153	2.6 mi southwest	St. Charles County	7,522±890	$107,841	$352,500	$1,461	84%
Tract 3117.3929183311739	2.5 mi southeast	St. Charles County	4,486±545	$139,487	$416,300	not published	83%
Tract 3118.0229183311802	2.0 mi north	St. Charles County	6,264±686	$88,320	$286,800	$1,128	81%
Tract 3119.0729183311907	1.4 mi northwest	St. Charles County	6,021±725	$65,052	$223,200	$1,459	81%
Tract 3117.3529183311735	1.9 mi southeast	St. Charles County	5,698±391	$149,625	$353,600	$2,132	74%
Tract 3117.3429183311734	2.1 mi northeast	St. Charles County	3,836±400	$103,258	$269,200	$1,867	71%
Tract 3117.1229183311712	0.7 mi north	St. Charles County	5,502±892	$107,479	$322,800	$1,392	70%
Tract 3117.3329183311733	1.7 mi east	St. Charles County	2,043±298	$88,672	$269,100	$1,240	70%
Tract 3111.5429183311154	2.0 mi south	St. Charles County	5,277±520	$133,013	$404,400	not published	67%
Tract 3122.0829183312208	4.4 mi southwest	St. Charles County	4,912±577	$142,841	$368,500	not published	65%
Tract 3117.3229183311732	1.2 mi south	St. Charles County	6,808±665	$110,250	$263,400	$1,421	61%
Tract 3122.0729183312207	3.4 mi southwest	St. Charles County	4,404±447	$93,070	$226,700	$1,471	57%
Tract 3122.0929183312209	5.1 mi southwest	St. Charles County	5,590±771	$165,417	$491,100	not published	56%
Tract 3118.0129183311801	3.9 mi north	St. Charles County	6,261±911	$108,386	$285,900	$1,608	51%
Tract 3111.5129183311151	3.9 mi south	St. Charles County	6,143±569	$136,818	$469,900	$1,387	49%
Tract 3111.2429183311124	4.0 mi southeast	St. Charles County	7,248±929	$128,542	$344,000	$1,741	48%
Tract 3117.3829183311738	0.6 mi east	St. Charles County	4,350±585	$71,914	$237,700	$1,275	46%
Tract 3111.5229183311152	2.7 mi south	St. Charles County	4,144±498	$132,647	$368,800	$2,000	38%
Tract 3117.2129183311721	2.7 mi east	St. Charles County	4,095±573	$129,656	$323,100	$1,831	18%
Tract 3120.9529183312095	5.0 mi northwest	St. Charles County	7,866±769	$124,194	$360,000	$1,365	15%
Tract 3114.2229183311422	3.4 mi east	St. Charles County	6,356±646	$88,979	$243,100	$1,508	9%
Tract 980029183980000	6.4 mi south	St. Charles County	9±11	not published	not published	not published	7%
Tract 3117.4029183311740	3.4 mi southeast	St. Charles County	2,196±423	$154,313	$446,100	$1,375	6%
Tract 3119.0429183311904	1.7 mi west	St. Charles County	7,234±584	$120,647	$420,100	$1,613	5%
Tract 311529183311500	7.2 mi northeast	St. Charles County	2,087±285	$49,182	$22,800	$1,116	4%
Tract 3122.0629183312206	9.9 mi west	St. Charles County	4,966±523	$142,484	$493,900	$1,533	3%

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