Saint John, IN ZIP code
The ZIP code for Saint John (also written St. John), Indiana is 46373. It is in Lake County.
- Population in these ZIPs
- 18,843
- Avg. median income
- $127,100population-weighted
- Typical home value
- $458,400population-weighted
- Metro area
- Chicago-Naperville-Elgin, IL-IN
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Saint John, IN ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 46373 | 18,843 | $127,146 | $458,400 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Saint John
- Dyer 3 mi
- Schererville 4 mi
- Cedar Lake 5 mi
- Griffith 6 mi
- Merrillville 6 mi
- Crown Point 7 mi
- Highland 7 mi
- Munster 8 mi
- Hammond 9 mi
- Gary 12 mi
- Lowell 13 mi
- Hobart 13 mi
Frequently asked questions
What is the ZIP code for Saint John, IN?
The ZIP code for Saint John, IN is 46373.
What county is Saint John, Indiana in?
Saint John ZIP codes are in Lake County.