Jefferson County, Missouri

Time zones in Jefferson County

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

1. 6302645,354 people
2. 6301034,478 people
3. 6312830,540 people
4. 6305228,712 people
5. 6302828,457 people
6. 6302020,166 people
7. 6302519,508 people
8. 6305018,744 people
9. 6304916,592 people
10. 6362816,416 people
11. 6306915,697 people
12. 6305113,436 people

26 ZIP Code areas overlap Jefferson County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Jefferson County, largest first

1. Rock Township34,422 people
2. Imperial Township24,351 people
3. Windsor Township22,366 people
4. Joachim Township21,970 people
5. Arnold Township20,956 people
6. Meramec Township19,708 people
7. River View Township18,656 people
8. High Ridge Township18,327 people
9. Valle Township15,829 people
10. Central Township14,773 people
11. Plattin Township11,820 people
12. Big River Township6,280 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Missouri, by county

School districts in Jefferson County, largest first

1. Rockwood R-VI School District122,218 people
2. Fox C-6 School District71,162 people
3. Northwest R-I School District44,026 people
4. Hillsboro R-III School District23,513 people
5. Meramec Valley R-III School District23,491 people
6. North St. Francis County R-I School District20,539 people
7. Festus R-VI School District19,625 people
8. Windsor C-1 School District18,917 people
9. De Soto 73 School District16,117 people
10. Dunklin R-V School District11,657 people
11. Jefferson County R-VII School District6,793 people
12. Grandview R-II School District4,671 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

1. Arnold, Missouri (city)20,956 people
2. Festus, Missouri (city)13,201 people
3. Eureka, Missouri (city)13,081 people
4. Murphy, Missouri (CDP)8,285 people
5. De Soto, Missouri (city)6,470 people
6. Pevely, Missouri (city)6,055 people
7. Barnhart, Missouri (CDP)5,785 people
8. Imperial, Missouri (CDP)5,488 people
9. Herculaneum, Missouri (city)5,071 people
10. Crystal City, Missouri (city)4,718 people
11. High Ridge, Missouri (CDP)3,714 people
12. Hillsboro, Missouri (city)3,500 people

Bordering areas, nearest first

Distances are straight lines between map points.

1. Monroe County, Illinois20 mi east
2. St. Louis County, Missouri27 mi north
3. Washington County, Missouri29 mi southwest
4. Franklin County, Missouri31 mi west
5. St. Francois County, Missouri31 mi south
6. Ste. Genevieve County, Missouri33 mi southeast

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See this county on Census.gov ↗