Who publishes Zip Code Lookup Table?

Governor's Office of Performance Improvement, part of State of Maryland, publishes this dataset on Maryland Open Data.

How often is it updated?

The publisher lists the update frequency as as needed. The last update was on 09/05/2018.

How do I download it?

It is available as CSV, JSON, XML. Use the links in Files and access, which open the official government source.

Checked Oct 28, 2026

State dataScience & Research

Zip Code Lookup Table

Name: Zip Code Lookup Table
Creator: State of Maryland
Published: 2018-09-05T03:41:27.000Z

Published by Governor's Office of Performance Improvement · Updated 09/05/2018 · As needed

Official source Download CSV

Last updated: 09/05/2018; First published 09/05/2018
Update frequency: As needed
Formats: 3; CSV, JSON, XML
Coverage: Maryland; Statewide

About this dataset

Includes Maryland Zip Codes and their corresponding cities/towns, and counties.

Science & Research

Files and access

Links open the official government source

CSV downloadopendata.maryland.govCSV
JSON (SODA API)opendata.maryland.govJSON
XMLopendata.maryland.govXML

API endpoint: https://opendata.maryland.gov/resource/ryxx-aeaf.json

Links open outside websites we do not control.

Frequently asked questions

Who publishes Zip Code Lookup Table?: Governor's Office of Performance Improvement, part of State of Maryland, publishes this dataset on Maryland Open Data.
How often is it updated?: The publisher lists the update frequency as as needed. The last update was on 09/05/2018.
How do I download it?: It is available as CSV, JSON, XML. Use the links in Files and access, which open the official government source.

Similar data from other publishers

Zip CodesDistrict of Columbia · US Postal ServiceZip Codes (5-digit). The dataset polygons represent location and attributes of zip codes, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. Zi
CSVGeoJSONShapefileKML+1Updated 06/04/2025

Where this catalog comes from

Data.gov CatalogU.S. General Services Administration
State and local open data portalsSocrata Discovery API
State and city CKAN portalsCalifornia, Virginia, Boston, Houston and more
Government ArcGIS Hub sitesCity and county GIS data

Catalog checked 10/24/2026

We list dataset descriptions only. Downloads and APIs link straight to the official government source, which holds the current version and its terms of use.

Source: Maryland Open Data and Data.gov · Last updated 10/24/2026 · Listing only; the data stays with the publisher