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County ZIP codes · South Carolina · FIPS 45005

Allendale County, SC ZIP Codes

Allendale County, South Carolina has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 6 residential and 1 for PO boxes or a single organization. 5 of the residential ones lie mainly in Allendale County and 1 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $26,835 in 29810 (Allendale) to $51,870 in 29812 (Barnwell) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Allendale County?

29810 · Allendale: $27k29812 · Barnwell: $52k29827 · Fairfax: $41k29836 · Martin: –29849 · Ulmer: $90k29932 · Luray: –29827298122981029836299322984929810 · Allendale: $27k29812 · Barnwell: $52k29827 · Fairfax: $41k29836 · Martin: –29849 · Ulmer: $90k29932 · Luray: –29827298122981029836299322984929810 · Allendale: $27k29812 · Barnwell: $52k29827 · Fairfax: $41k29836 · Martin: –29849 · Ulmer: $90k29932 · Luray: –298272981229810298362993229849
The residential ZIP codes of Allendale 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 6 postal town names: Barnwell, Allendale, Fairfax, Martin, Luray, Ulmer.

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

All 6 residential ZIP codes in Allendale County

5 ZIP codes lie mainly in Allendale County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Allendale County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
29810 Allendale 3,775 30 $27k $80k 100%
29827 Fairfax 3,396 32 $41k $67k 96%
29836 Martin 326 3 – $108k 83%
29932 Luray 322 5 – $154k 89%
29849 Ulmer 271 7 $90k $161k 73%

Partly in Allendale County

Residential ZIP codes mainly in another county that reach at least 1% into Allendale County, by their share here
In this county
29812 Barnwell 11,132 64 $52k $113k 2%

Download the 7 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?

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

Share of each ZIP code's land in Allendale County and in the neighboring counties
ZIPIn AllendaleElsewhere
298122%Barnwell County 98%
2982796%Hampton County 4%
2983683%Barnwell County 17%
2993289%Hampton County 11%
2984973%Barnwell County 27%

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

PO Box and single-organization ZIP codes

ZIP codes in Allendale County without a residential area (GeoNames postal codes)
ZIPPostal name
29846Sycamore

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Allendale County's ZIP codes use 2 prefixes: 298 and 299.

Three-digit prefixes of Allendale 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 Allendale County's
PrefixSectional centerHereAll codes
298 Augusta, GA (SCF 308) 6 44
299 Charleston, SC (SCF 294) 1 39

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