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County ZIP codes · Michigan · FIPS 26147

St. Clair County, MI ZIP Codes

St. Clair County, Michigan has 25 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 23 residential and 2 for PO boxes or a single organization. 21 of the residential ones lie mainly in St. Clair County and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $53,018 in 48060 (Port Huron) to $109,730 in 48028 (Harsens Island) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of St. Clair County?

48001 · Algonac: $69k48002 · Allenton: $94k48006 · Avoca: $71k48014 · Capac: $67k48022 · Emmett: $97k48023 · Fair Haven: $71k48027 · Goodells: $90k48028 · Harsens Island: $110k48032 · Jeddo: $97k48039 · Marine City: $83k48040 · Marysville: $67k48041 · Memphis: $76k48049 · North Street: $84k48054 · East China: $83k48059 · Fort Gratiot: $80k48060 · Port Huron: $53k48063 · Columbus: $94k48064 · Casco: $88k48074 · Smiths Creek: $71k48079 · Saint Clair: $80k48097 · Yale: $64k48416 · Brown City: $67k48444 · Imlay City: $71k4841648097484444800648059480284803248079480014804148054480144802748074480634806448049480024802248060480394802348001 · Algonac: $69k48002 · Allenton: $94k48006 · Avoca: $71k48014 · Capac: $67k48022 · Emmett: $97k48023 · Fair Haven: $71k48027 · Goodells: $90k48028 · Harsens Island: $110k48032 · Jeddo: $97k48039 · Marine City: $83k48040 · Marysville: $67k48041 · Memphis: $76k48049 · North Street: $84k48054 · East China: $83k48059 · Fort Gratiot: $80k48060 · Port Huron: $53k48063 · Columbus: $94k48064 · Casco: $88k48074 · Smiths Creek: $71k48079 · Saint Clair: $80k48097 · Yale: $64k48416 · Brown City: $67k48444 · Imlay City: $71k4841648097484444800648059480284803248079480014804148054480144802748074480634806448049480024802248060480394802348001 · Algonac: $69k48002 · Allenton: $94k48006 · Avoca: $71k48014 · Capac: $67k48022 · Emmett: $97k48023 · Fair Haven: $71k48027 · Goodells: $90k48028 · Harsens Island: $110k48032 · Jeddo: $97k48039 · Marine City: $83k48040 · Marysville: $67k48041 · Memphis: $76k48049 · North Street: $84k48054 · East China: $83k48059 · Fort Gratiot: $80k48060 · Port Huron: $53k48063 · Columbus: $94k48064 · Casco: $88k48074 · Smiths Creek: $71k48079 · Saint Clair: $80k48097 · Yale: $64k48416 · Brown City: $67k48444 · Imlay City: $71k48416480974844448006480284803248079480014804148054480144807448039
The residential ZIP codes of St. Clair 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?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $69,160 and $90,417.

They carry 23 postal town names.

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

All 23 residential ZIP codes in St. Clair County

21 ZIP codes lie mainly in St. Clair County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in St. Clair County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
48060 Port Huron 39,342 1,897 $53k $161k 100%
48059 Fort Gratiot 15,499 489 $80k $222k 100%
48079 Saint Clair 12,711 304 $80k $293k 100%
48001 Algonac 11,224 590 $69k $257k 100%
48040 Marysville 9,925 1,436 $67k $209k 100%
48074 Smiths Creek 9,624 259 $71k $198k 100%
48039 Marine City 7,437 323 $83k $181k 100%
48054 East China 7,188 177 $83k $301k 100%
48049 North Street 5,468 153 $84k $236k 100%
48097 Yale 5,418 71 $64k $199k 78%
48023 Fair Haven 5,031 295 $71k $244k 100%
48041 Memphis 4,302 108 $76k $317k 97%
48014 Capac 4,294 117 $67k $218k 96%
48063 Columbus 4,206 114 $94k $323k 100%
48064 Casco 4,180 113 $88k $303k 100%
48006 Avoca 3,889 54 $71k $240k 100%
48027 Goodells 3,187 85 $90k $274k 100%
48002 Allenton 3,120 84 $94k $313k 100%
48022 Emmett 2,530 72 $97k $240k 100%
48032 Jeddo 1,871 51 $97k $264k 80%
48028 Harsens Island 1,272 72 $110k $391k 100%

Partly in St. Clair County

Residential ZIP codes mainly in another county that reach at least 1% into St. Clair County, by their share here
In this county
48444 Imlay City 9,483 116 $71k $239k 6%
48416 Brown City 4,996 44 $67k $222k 6%

Download the 25 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?

6 ZIP codes of St. Clair County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in St. Clair County and in the neighboring counties
ZIPIn St. ClairElsewhere
484446%Lapeer County 94%
4809778%Sanilac County 22%
484166%Sanilac County 54%; Lapeer County 40%
4804197%Macomb County 3%
4801496%Lapeer County 4%
4803280%Sanilac County 20%

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

PO Box and single-organization ZIP codes

ZIP codes in St. Clair County without a residential area (GeoNames postal codes)
ZIPPostal name
48004Anchorville
48061Port Huron

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do St. Clair County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. St. Clair County's ZIP codes use 2 prefixes: 480 and 484.

Three-digit prefixes of St. Clair 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 St. Clair County's
PrefixSectional centerHereAll codes
480 Metroplex, MI (SCF 480) 23 79
484 Metroplex, MI (SCF 480) 2 60

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