Residential delivery area · Indiana
ZIP Code 46373: Saint John, IN
ZIP code 46373 uses the postal name Saint John, Indiana and lies entirely in Lake County (Census 2020 ZIP-county file). About 19,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $127,146 (Census Bureau, ACS 2020-2024). Most of its land (91%) lies in the city of St. John.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Saint John · its only residential ZIP
- County
- Lake County
- Census places
- St. John
- Metro area
- Chicago-Naperville-Elgin, IL-IN
- House district
- IN-1 119th Congress
- State
- Indiana
- Time zone
- Central
- Land area
- 10.9 sq mi · 1,732 people per sq mi
Where is ZIP code 46373?
46373 centers on 41.442°, -87.468° and covers 10.9 square miles of land plus 0.1 of water. It borders 4 ZIP codes: 46311, 46375, 46303, 46307.
The map draws ZIP code areas only. For the streets inside 46373, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 46373 compare with the rest of Lake County?
| Measure | 46373 | In Lake County | In IN |
|---|---|---|---|
| People (ACS 2020-2024) | 18,843 | 12th of 28 | 136th of 807 |
| Median household income | $127k | 1st of 26 | 10th of 478 |
| Median home value | $409k | 1st of 25 | 10th of 509 |
Its median household income is higher than in 92% of U.S. residential ZIP codes, and it is denser than 83% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 46373?
The 2020 Census counted 17,839 people in 46373; the ACS, which samples households over 2020-2024, estimates 18,843. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 18,843
- 2020 Census count
- 17,839
- Households
- 6,658
- Median age
- 44.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 46373?
Of the 18,843 people the ACS estimates in 46373, 23.2% are under 18 and 20.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.9%), then Hispanic or Latino (11.5%).
- Under 1823.2%
- 18 to 6456.4%
- 65 and older20.5%
- White, not Hispanic80.9%
- Hispanic or Latino11.5%
- Other or two or more4.0%
- Black, not Hispanic2.1%
- Asian, not Hispanic1.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 46373 earn?
Median household income is $127,146 (ACS 2020-2024), the highest of the 26 ranked ZIP codes in Lake County.
- Median household income
- $127,146
- Income per person
- $56,346
- Below the poverty line
- 2.8%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 42.5%
- Adjusted gross income per tax return, 2022
- $127,3759,680 returns; wages 67% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 46373?
FHFA's house price index for 46373, built from repeat sales and appraisals of the same homes, rose 58% from 2015 to 2025 and rose 35% from 2020 to 2025, and moved +3.5% in 2025.
- Median home value (owners' estimate)
- $408,900
- Median gross rent
- $981
- Homes owned by their occupants
- 97.1%
- Housing units
- 6,751
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 46373?
402 business establishments had a location in this ZIP code in 2023, 59 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction61
- Health care and social assistance50
- Retail trade47
- Professional, scientific, and technical services40
- Finance and insurance35
- Other services (except public administration)35
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 46373?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 46311 | Dyer | 23,321 | $117k | 2.8 mi |
| 46375 | Schererville | 24,188 | $93k | 3.5 mi |
| 46303 | Cedar Lake | 17,680 | $84k | 4.7 mi |
| 46307 | Crown Point | 71,673 | $108k | 7.9 mi |
| 46319 | Griffith | 17,847 | $75k | 6.0 mi (near) |
| 60417 | Crete, IL | 14,901 | $92k | 6.2 mi (near) |
| 46322 | Highland | 23,680 | $78k | 7.3 mi (near) |
| 46410 | Merrillville | 39,243 | $64k | 7.4 mi (near) |
| 46321 | Munster | 23,733 | $110k | 7.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.