ZIP Codes of Marion County, IN

Population & People
Population & People
Total Population
989,752
Household Income
Household Income
Median Income
$73,034
Housing
Housing
Total Housing Units
446,779
Business & Economy
Business & Economy
Total Businesses
24,897
Employment
Employment
Employment Rate
65.15%
Education
Education
Bachelor's Degree+
35.08%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 56 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:56 ZIP Codes (37 Standard, 9 PO Box, 10 Unique) [See All]
Area Codes:317 / 463 / 765
Timezone:Eastern (GMT -05:00)
Local Time:11:53:25 PM
Population:989,752 [See All]
FIPS:18097
CBSA:Indianapolis-Carmel-Greenwood, IN
Land Area:419 sq mi
Water Area:8 sq mi
Coordinates:39.7857, -86.1556
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Indiana's largest county
989,752 residents — the most of 92 counties in Indiana.
Indiana's densest county
2,361 people per square mile.
Sharp income gradient
Wealthiest ZIP earns 4.2× the poorest — $158,648 vs $38,063.
Indiana's most foreign-born county
12.7% of residents are foreign-born.
Extreme geographic sprawl
The largest ZIP spans 3019× the smallest by area — 28.1 sq mi down to 0.01.
Extreme education divide
Bachelor's share ranges 11.8% to 68.1% across ZIPs — a 56-point gap.

Standout ZIPs in this County


Most Populous
Indianapolis · 57,587 people
5.8% of county total
Highest Income
Indianapolis · $158,648 median
2.2× county average
Largest Land Area
Indianapolis · 28.1 sq mi
Spans the most ground
Fastest Growth
Indianapolis · 80.7% (10-yr)
6,309 → 11,400 residents
Most Educated
Indianapolis · 68.1% bachelor's+
17,987 of 26,401 adults 25+

Things worth knowing about Marion County


989,752 residents live across 56 ZIPs covering 419 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 933,033 to 989,752 from 2014 to 2024 — a +6.1% change. 25 ZIPs gained residents, 12 lost.

The county's wealthiest ZIP 46278 (Indianapolis, $158,648 median) and poorest ZIP 46218 (Indianapolis, $38,063) are 11.9 miles apart — a 4.2× income gap across local geography.

Median home values vary 4.3× across this county — from $103,100 in 46218 (Indianapolis) to $439,200 in 46202 (Indianapolis).

Density varies 18× across the county — from 627 people/sq mi in 46278 (Indianapolis) to 11,032 in 46204 (Indianapolis).

Most of the decade's growth concentrated around Indianapolis — top growth ZIPs averaged +56.5% over the past ten years ( 46204 , 46216 and 46259 ).

Educational attainment ranges from 11.8% bachelor's+ in 46218 (Indianapolis) to 68.1% in 46220 (Indianapolis) — the breadth of educational profiles across the area.

Within Indiana, this is the #1 most populous of 92 counties and ranks #42 for median household income with the #15 fastest decade growth .

On the national stage, Marion County is the #51 most populous US county .

Hosts 4 single-entity Unique ZIPs: 46249Fort Benjamin Harrison ; 46283Indianapolis ; 46255Merchants Bank ; and 46277Indianapolis .

Weighted by population, the typical household earns about $69,874 across the county — reflecting what a typical resident sees, not a simple ZIP average.

35.1% of adults age 25+ hold a bachelor's degree or higher (227,856 of 649,607 reporting). The most-educated ZIPs cluster around Indianapolis.

37 Standard delivery, 9 PO Box only, 10 single-entity Unique ZIPs serve this county.

Stories about Marion County


Higher-education hub

5 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.

Indianapolis
68.1%
36,952 residents
Indianapolis
64.9%
20,180 residents
Indianapolis
64.0%
8,450 residents
Indianapolis
63.1%
11,400 residents
Indianapolis
62.1%
19,595 residents

Single-entity addresses

10 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.

Merchants Bank
non-residential
Indianapolis
non-residential
Ww Grainger Inc
non-residential
Indianapolis
non-residential
Shared Zip Code
non-residential
Huntington Bank
non-residential
Indianapolis Brm
non-residential
Indianapolis
non-residential
Greater Indiana District
non-residential
Fort Benjamin Harrison
non-residential

Two counties in one

Median household income spans 4.2× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.

Wealthiest ZIP
Indianapolis
Median income: $158,648
Population: 8,450
Bachelor's+: 64.0%
vs
Poorest ZIP (pop >= 500)
Indianapolis
Median income: $38,063
Population: 29,360
Bachelor's+: 11.8%
For every $1 of household income in 46218, the typical household in 46278 earns $4.17.

All ZIP Codes in Marion County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
46227IndianapolisStandard57,587$53,62916.7-0.6%
46226IndianapolisStandard47,099$50,32514.72.8%
46237IndianapolisStandard43,473$79,07814.66.9%
46254IndianapolisStandard40,674$60,28714.06.3%
46224IndianapolisStandard40,228$55,9867.813.3%
46222IndianapolisStandard38,887$50,78310.714.7%
46219IndianapolisStandard38,855$60,80313.111.6%
46203IndianapolisStandard37,758$57,39313.8-0.6%
46220IndianapolisStandard36,952$108,05012.36.9%
46217IndianapolisStandard36,917$92,02922.523.5%
46235IndianapolisStandard36,317$58,9518.913.6%
46260IndianapolisStandard35,707$72,50410.48.4%
46239IndianapolisStandard33,931$100,33128.124.8%
46241IndianapolisStandard32,565$53,65325.14.6%
46201IndianapolisStandard30,335$49,1955.7-2.4%
46218IndianapolisStandard29,360$38,0639.50.8%
46229IndianapolisStandard28,457$61,38811.11.7%
46234IndianapolisStandard28,300$83,19013.15.1%
46205IndianapolisStandard28,259$72,4176.52.9%
46221IndianapolisStandard27,027$65,28020.72.7%
46236IndianapolisStandard26,416$115,66412.5-1.7%
46268IndianapolisStandard25,913$68,63112.6-0.5%
46214IndianapolisStandard24,472$59,1787.6-1.8%
46208IndianapolisStandard22,379$60,0626.7-0.8%
46256IndianapolisStandard20,990$93,84712.2-8.0%
46202IndianapolisStandard20,180$63,5065.620.9%
46240IndianapolisStandard19,595$75,15610.8-1.2%
46250IndianapolisStandard18,147$67,3288.21.7%
46228IndianapolisStandard15,724$91,1568.33.1%
46259IndianapolisStandard15,169$129,34522.927.7%
46107Beech GroveStandard13,020$56,7993.52.9%
46204IndianapolisStandard11,400$86,3961.080.7%
46231IndianapolisStandard10,371$71,8257.4-8.3%
46278IndianapolisStandard8,450$158,64813.512.6%
46225IndianapolisStandard6,037$55,1904.2-14.9%
46216IndianapolisStandard2,767$53,1612.861.1%
46183West NewtonPO Box340.1-86.2%
46206IndianapolisPO Box00.0
46255IndianapolisUnique0.0
46277IndianapolisUnique0.0
46282IndianapolisStandard0.0
46242IndianapolisPO Box0.0
46251IndianapolisPO Box0.0
46244IndianapolisPO Box0.0
46247IndianapolisPO Box0.0
46213IndianapolisUnique0.0
46285IndianapolisUnique0.0
46288IndianapolisUnique0.0
46262IndianapolisUnique0.0
46207IndianapolisPO Box0.0
46209IndianapolisUnique0.0
46283IndianapolisUnique0.0
46298IndianapolisUnique0.0
46230IndianapolisPO Box0.0
46249IndianapolisUnique0.1
46253IndianapolisPO Box0.0

Adjacent & Nearby Counties