ZIP Code to CBSA Lookup
Free U.S. MSA finder using official HUD USPS ZIP Code Crosswalk data
Metropolitan Statistical Area Lookup - Free CBSA API
Instant lookup for U.S. ZIP codes mapped to their CBSAs using the official HUD USPS crosswalk. Search 39,482 ZIP codes across all 936 Metropolitan and Micropolitan Statistical Areas. No registration required — this dataset covers United States ZIP codes only.