| ZIP Codes: | 32 ZIP Codes (25 Standard, 7 PO Box, 0 Unique) [See All] |
| Area Code: | 219 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:07 PM |
| Population: | 504,725 [See All] |
| FIPS: | 18089 |
| CBSA: | Chicago-Naperville-Elgin, IL-IN |
| Land Area: | 471 sq mi |
| Water Area: | 17 sq mi |
| Coordinates: | 41.5084, -87.3995 |
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504,725 residents live across 32 ZIPs covering 471 sq mi, served by 19 distinct USPS-recognized cities.
Population moved from 496,372 to 504,725 from 2014 to 2024 — a +1.7% change. 11 ZIPs gained residents, 16 lost.
The county's wealthiest ZIP 46373 (Saint John, $127,146 median) and poorest ZIP 46407 (Gary, $28,526) are 11.5 miles apart — a 4.5× income gap across local geography.
Median home values vary 6.8× across this county — from $60,200 in 46407 (Gary) to $408,900 in 46373 (Saint John).
Density varies 28× across the county — from 173 people/sq mi in 46356 (Lowell) to 4,812 in 46324 (Hammond).
Educational attainment ranges from 7.8% bachelor's+ in 46405 (Lake Station) to 49.9% in 46321 (Munster) — the breadth of educational profiles across the area.
Within Indiana, this is the #2 most populous of 92 counties and ranks #68 for median household income .
Weighted by population, the typical household earns about $76,246 across the county — reflecting what a typical resident sees, not a simple ZIP average.
25.8% of adults age 25+ hold a bachelor's degree or higher (89,330 of 345,919 reporting).
25 Standard delivery, 7 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 4.5× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 46307 | Crown Point | Standard | 71,673 | $107,800 | 87.8 | 18.8% |
| 46410 | Merrillville | Standard | 39,243 | $64,127 | 30.9 | 1.4% |
| 46342 | Hobart | Standard | 32,224 | $75,521 | 36.1 | 2.7% |
| 46312 | East Chicago | Standard | 26,022 | $42,125 | 14.3 | -11.5% |
| 46375 | Schererville | Standard | 24,188 | $93,160 | 13.2 | 2.9% |
| 46321 | Munster | Standard | 23,733 | $110,187 | 7.6 | 1.7% |
| 46322 | Highland | Standard | 23,680 | $78,062 | 6.9 | 1.1% |
| 46311 | Dyer | Standard | 23,321 | $116,652 | 12.9 | 4.4% |
| 46323 | Hammond | Standard | 23,047 | $59,688 | 6.2 | -0.6% |
| 46324 | Hammond | Standard | 21,409 | $63,052 | 4.4 | -6.5% |
| 46356 | Lowell | Standard | 19,721 | $89,217 | 113.9 | 11.9% |
| 46373 | Saint John | Standard | 18,843 | $127,146 | 11.0 | 33.7% |
| 46319 | Griffith | Standard | 17,847 | $74,662 | 9.6 | -0.6% |
| 46303 | Cedar Lake | Standard | 17,680 | $84,211 | 30.4 | 26.3% |
| 46408 | Gary | Standard | 15,747 | $47,453 | 9.1 | -3.6% |
| 46404 | Gary | Standard | 15,428 | $42,256 | 6.5 | -8.9% |
| 46320 | Hammond | Standard | 14,353 | $37,158 | 4.4 | -3.6% |
| 46405 | Lake Station | Standard | 12,184 | $60,881 | 8.4 | 7.1% |
| 46394 | Whiting | Standard | 11,894 | $66,176 | 4.6 | -2.6% |
| 46403 | Gary | Standard | 10,929 | $45,991 | 10.0 | -14.0% |
| 46327 | Hammond | Standard | 10,597 | $47,288 | 4.7 | -6.5% |
| 46406 | Gary | Standard | 9,001 | $35,839 | 13.4 | -11.7% |
| 46407 | Gary | Standard | 8,577 | $28,526 | 4.4 | -31.2% |
| 46409 | Gary | Standard | 7,184 | $44,667 | 3.5 | -17.4% |
| 46402 | Gary | Standard | 5,836 | $33,529 | 9.7 | -8.2% |
| 46376 | Schneider | PO Box | 319 | $64,205 | 7.0 | -5.6% |
| 46377 | Shelby | PO Box | 45 | $38,958 | 0.0 | -88.8% |
| 46355 | Leroy | PO Box | — | — | 0.0 | — |
| 46308 | Crown Point | PO Box | — | — | 0.0 | — |
| 46411 | Merrillville | PO Box | — | — | 0.0 | — |
| 46325 | Hammond | PO Box | — | — | 0.0 | — |
| 46401 | Gary | PO Box | — | — | 0.0 | — |