Montgomery County, MDThe Census Bureau created zip code tabulation areas for statistical purposes by adjusting postal zip codes slightly to coincide with Census Block boundaries. As zip codes do not always follow County boundaries, some of the zip code tabulation areas extend into neighboring counties. Because this layer will differ from USPS zip codes in locations where the postal zip code splits a street block, this layer should not be used for determining mailing zip code at an address. Can be downloaded from the GIS Data Portal here . Access directly in the TEBS-GIS database in SDE.CENSUS, SDE.tl_2020_us_zct_MoCoArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/4d30f1b5aeb74cf5bdbac2778ae8ead1_0engMontgomery County GIS Open DataPublicZip Code Tabulation Areas 2020 [Maryland--Montgomery County]Web servicesMaryland--Montgomery CountyMaryland2020