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Census tracts listed in the County Code correspond to the first six digits of the GIS attribute CTCB10.City Boundaries and City Annexations provide current and historical legal city boundary information on this portal.", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102645, "latestWkid": 2229, "xyTolerance": 0.0032808333333333335, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -117608900, "falseY": -91881400, "xyUnits": 3048.0060960121914, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "copyrightText": "This data is maintained by the Los Angeles County Department of Public Works. 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