County ZIP codes · Puerto Rico · FIPS 72131

San Sebastián Municipio, PR ZIP Codes

San Sebastián Municipio, Puerto Rico has 2 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 1 of the residential ones lie mainly in San Sebastián Municipio and 1 mainly in a neighboring county; 2 cross the county line. Median household income ranges from $20,310 in 00685 (San Sebastian) to $23,874 in 00678 (Quebradillas) (Census Bureau, ACS 2020-2024).

ACS2020-24
Census2020

Where are the ZIP codes of San Sebastián Municipio?

The residential ZIP codes of San Sebastián Municipio (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?

00685 · $20k 00678 · $24k

They carry 2 postal town names: San Sebastian, Quebradillas.

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

All 2 residential ZIP codes in San Sebastián Municipio

1 ZIP code lies mainly in San Sebastián Municipio; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in San Sebastián Municipio, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
00685	San Sebastian	39,988	508	$20k	$116k	88%

Partly in San Sebastián Municipio

Residential ZIP codes mainly in another county that reach at least 1% into San Sebastián Municipio, by their share here
						In this county
00678	Quebradillas	24,595	844	$24k	$112k	5%

Download the 2 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?

2 ZIP codes of San Sebastián Municipio extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in San Sebastián Municipio and in the neighboring counties
ZIP	In San Sebastián	Elsewhere
00685	88%	Isabela Municipio 11%
00678	5%	Quebradillas Municipio 78%; Isabela Municipio 17%

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

Which first three digits do San Sebastián Municipio'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 San Sebastián Municipio starts with 006.

Three-digit prefixes of San Sebastián Municipio'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 San Sebastián Municipio's
Prefix	Sectional center	Here	All codes
006	San Juan, PR (SCF 006)	2	51

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