Puget Sound Regional CouncilThe city boundaries are updated on a quarterly basis using annexation information from OFM ( https://ofm.wa.gov/washington-data-research/annexations-and-municipal-boundary-changes) . VISION 2050 regional geography classifications were added to the dataset in 2020. UPDATE HISTORY: 2025-06-30: Updated the name of "Sea Tac" to "SeaTac" (without the space) 2025-09-05: Annexation update for Monroe and Mukilteo 2025-12-10: Small piece of land annexed from Bellevue to KirklandArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a8358833de1f4902bee903cf32274753_0engPuget Sound Regional Council Data PortalPublicCity Boundaries [Washington (State)--Puget Sound Region]Web servicesWashington (State)--Puget Sound RegionWashington (State)Last Modified: 2025-12-10