ZIP Codes Box

Washington County, Missouri ZIP codes

10ZIP codes
10Cities and towns
21,955People in ZIP areas
573, 636Area codes

Washington County is in Missouri and the Central Time zone. ZIP codes don’t follow county lines exactly, so a ZIP code listed here can reach into a neighboring county.

All ZIP codes in Washington County

ZIP codeCityTypePopulationMedian income
63030FletcherStandard557$91,042
63071RichwoodsStandard1,113$44,853
63622BelgradeStandard764$31,750
63626BlackwellStandard588$82,599
63630CadetStandard4,006$52,482
63631CaledoniaStandard544$74,211
63648IrondaleStandard1,858$51,765
63660Mineral PointStandard2,784$51,410
63664PotosiStandard9,693$61,216
63674TiffPO Box only48–

Cities and towns in Washington County

Area codes in Washington County

Questions

How many ZIP codes are in Washington County, MO?
Washington County has 10 ZIP codes, 9 of them standard ZIP codes for street addresses.
What cities are in Washington County?
Washington County ZIP codes cover Belgrade, Blackwell, Cadet, Caledonia, Fletcher, Irondale, Mineral Point and Potosi and 2 other places.
What area code is Washington County, MO?
Washington County uses area codes 573 and 636.
What time zone is Washington County in?
Washington County is in Central Time.

Other Missouri counties