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County ZIP codes · Missouri · FIPS 29093

Iron County, MO ZIP Codes

Iron County, Missouri has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 9 of the residential ones lie mainly in Iron County and 7 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $41,984 in 63624 (Bismarck) to $50,277 in 65565 (Steelville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Iron County?

63620 · Annapolis: $42k63621 · Arcadia: $88k63623 · Belleview: $45k63624 · Bismarck: $42k63625 · Black: –63631 · Caledonia: $74k63636 · Des Arc: $65k63650 · Ironton: $50k63654 · Lesterville: $37k63656 · Middle Brook: $47k63663 · Pilot Knob: $45k63675 · Vulcan: $16k65439 · Bixby: $22k65440 · Boss: $37k65565 · Steelville: $50k65566 · Viburnum: $40k65565636206544063650636236365463621636566362463625636366363165439655666367563620 · Annapolis: $42k63621 · Arcadia: $88k63623 · Belleview: $45k63624 · Bismarck: $42k63625 · Black: –63631 · Caledonia: $74k63636 · Des Arc: $65k63650 · Ironton: $50k63654 · Lesterville: $37k63656 · Middle Brook: $47k63663 · Pilot Knob: $45k63675 · Vulcan: $16k65439 · Bixby: $22k65440 · Boss: $37k65565 · Steelville: $50k65566 · Viburnum: $40k655656362065440636506362363654636216365663624636256363663631654396367563620 · Annapolis: $42k63621 · Arcadia: $88k63623 · Belleview: $45k63624 · Bismarck: $42k63625 · Black: –63631 · Caledonia: $74k63636 · Des Arc: $65k63650 · Ironton: $50k63654 · Lesterville: $37k63656 · Middle Brook: $47k63663 · Pilot Knob: $45k63675 · Vulcan: $16k65439 · Bixby: $22k65440 · Boss: $37k65565 · Steelville: $50k65566 · Viburnum: $40k6556563620654406365063623636546362163624636256363665439
The residential ZIP codes of Iron County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

They carry 16 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 16 residential ZIP codes in Iron County

9 ZIP codes lie mainly in Iron County; 7 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Iron County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
63650 Ironton 3,600 32 $50k $123k 75%
63621 Arcadia 1,632 21 $88k $175k 69%
63620 Annapolis 1,036 5 $42k $203k 69%
63623 Belleview 895 8 $45k $141k 100%
63663 Pilot Knob 649 827 $45k $109k 100%
63656 Middle Brook 576 8 $47k $102k 51%
63636 Des Arc 446 10 $65k $65k 46%
65439 Bixby 55 2 $22k – 100%
63675 Vulcan 24 2 $16k $563k 100%

Partly in Iron County

Residential ZIP codes mainly in another county that reach at least 1% into Iron County, by their share here
In this county
65566 Viburnum 858 75 $40k $94k 36%
63631 Caledonia 544 13 $74k $128k 35%
63625 Black 382 5 – $211k 18%
63624 Bismarck 3,447 57 $42k $90k 16%
65565 Steelville 4,845 18 $50k $163k 8%
65440 Boss 206 2 $37k $107k 5%
63654 Lesterville 752 11 $37k $188k 1%

Download the 16 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

12 ZIP codes of Iron County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Iron County and in the neighboring counties
ZIPIn IronElsewhere
655658%Crawford County 81%; Washington County 11%
6365075%St. Francois County 22%; Madison County 3%
6362416%St. Francois County 55%; Washington County 29%
6362169%Madison County 31%
6362069%Madison County 21%; Reynolds County 11%
6556636%Crawford County 64%
636541%Reynolds County 99%
6365651%Reynolds County 49%
6363135%Washington County 65%
6363646%Wayne County 30%; Madison County 24%
6362518%Reynolds County 82%
654405%Dent County 55%; Reynolds County 40%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Iron County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Iron County's ZIP codes use 3 prefixes: 636, 654 and 655.

Three-digit prefixes of Iron County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Iron County's
PrefixSectional centerHereAll codes
636 St Louis, MO (SCF 630) 12 37
654 Springfield, MO (SCF 656) 2 29
655 Springfield, MO (SCF 656) 2 33

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.