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County ZIP codes · Oklahoma · FIPS 40059

Harper County, OK ZIP Codes

Harper County, Oklahoma has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 2 of the residential ones lie mainly in Harper County and 5 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $57,619 in 73848 (Laverne) to $72,500 in 73834 (Buffalo) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Harper County?

73801 · Woodward: $59k73834 · Buffalo: $73k73842 · Freedom: –73844 · Gate: –73848 · Laverne: $58k73851 · May: $61k73855 · Rosston: $63k7384873801738347384273844738557385173801 · Woodward: $59k73834 · Buffalo: $73k73842 · Freedom: –73844 · Gate: –73848 · Laverne: $58k73851 · May: $61k73855 · Rosston: $63k7384873801738347384273844738557385173801 · Woodward: $59k73834 · Buffalo: $73k73842 · Freedom: –73844 · Gate: –73848 · Laverne: $58k73851 · May: $61k73855 · Rosston: $63k73848738017383473842738447385573851
The residential ZIP codes of Harper 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 7 postal town names: Woodward, Laverne, Buffalo, Freedom, Gate, Rosston, May.

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

All 7 residential ZIP codes in Harper County

2 ZIP codes lie mainly in Harper County; 5 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Harper County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
73834 Buffalo 1,544 3 $73k $92k 100%
73855 Rosston 253 2 $63k $186k 100%

Partly in Harper County

Residential ZIP codes mainly in another county that reach at least 1% into Harper County, by their share here
In this county
73848 Laverne 1,555 3 $58k $124k 43%
73851 May 111 1 $61k $57k 31%
73801 Woodward 14,892 32 $59k $169k 22%
73844 Gate 297 1 – $101k 11%
73842 Freedom 354 1 – $213k 9%

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 Harper County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Harper County and in the neighboring counties
ZIPIn HarperElsewhere
7380122%Woodward County78%
7384843%Beaver County57%
738429%Woods County67%; Woodward County25%
7384411%Beaver County89%
7385131%Ellis County69%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Harper County starts with 738.

Three-digit prefixes of Harper 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 Harper County's
PrefixSectional centerHereAll codes
738Oklahoma City, OK (SCF 730)720

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