Description: This data is the product of 2020 census block group split by 2024 incorporated city boundaries and unincorporated community/countywide statistical areas (CSA) boundaries and 2021 Supervisorial District boundaries. The split block group boundaries have been altered and aligned where necessary with legal city boundaries and unincorporated areas, including along shoreline/coastal areas. This data is also known as the Split Tract data. Census Tract:The Census Bureau (https://www.census.gov/)released 2020 geographic boundaries data including census tracts for the analysis and mapping of demographic information across the United States. Census Block Group: Block Groups (BGs) are statistical sub-divisions of census tracts, and are used to present data and control block numbering. A block group consist of cluster of blocks having the same first digit of their four-digit identifying number within the same census tract. BGs are generally defined to contain between 600 and 3,000 people and 240 and 1,200 housing unit. BGs are the smallest geographic unit for which the Census Bureau tabulates sample data. A BG usually covers a contiguous area and BGs are uniquely numbered within the census tract. Within the standard census geography hierarchy, BGs never cross state, county, or census tract boundaries but may cross the boundaries of any other geographic entity. There are little more number of Census Block Groups within Los Angeles County in 2020 Census TIGER/Line Shapefiles, compared in 2010.City Boundary:City Boundary data is the base map information for the County of Los Angeles. These City Boundaries are based on the Los Angeles County Seamless Cadastral Landbase. The Landbase is jointly maintained by the Los Angeles County Assessor and the Los Angeles County Department of Public Works (DPW). This layer represents current city boundaries within Los Angeles County. The DPW provides the most current shapefiles representing city boundaries and city annexations. True, legal boundaries are only determined on the ground by surveyors licensed in the State of California.Countywide Statistical Areas (CSA): The countywide Statistical Area (CSA) was defined to provide a common geographic boundary for reporting departmental statistics for unincorporated areas and incorporated Los Angeles city to the Board of Supervisors. The CSA boundary and CSA names are established by the CIO and the LA County Enterprise GIS group worked with the Los Angeles County Board of Supervisors Unincorporated Area and Field Deputies that reflect as best as possible the general name preferences of residents and historical names of areas. This data is primarily focused on broad statistics and reporting, not mapping of communities. This data is not designed to perfectly represent communities, nor jurisdictional boundaries such as Angeles National Forest. Low and Moderate Data:The low- and moderate-income summary data (LMISD) based on the American Community Survey 2016-2020 5-year estimates (2020 ACS) published by U.S. Department of Housing and Urban Development HUD).Data Field:UniqueID: ID field (combination of 2020 census block group number, 2024 city/community and 2021 supervisorial District number)CT20: 2020 Census TractCTLABEL: census tract number with two decimal placesCTBG20: 2020 census tract and block group numberBG20: 2020 census block group numberCITYNAME: Incorporated city name or unincorporated areaCOMMNAME: Legal city name or unincorporated area community nameSUP: 2021 supervisorial district numberLOW: Number of persons with family income less than 50% of the Area Median Income (AMI)MOD (moderate): Number of persons with family income at least 50% but less than 80% of the AMILOWMOD: Sum of LOW and MOD / number of persons with family income less than 80% of the AMILOWMODUNIV: Number of persons with the potential for being deemed LOW or MOD. Use as denominator for calculating percentageLOWMOD_PCT: The percentage of persons who are of low/moderate income; calculated by LOWMOD/LOWMODUNIV times 100POP_TOT: Number of people from 2020 ACS 5YR Summary File (TabID B01001)PARTICIPANT: Incorporated cities and unincorporated communities participating the CDBG (Community Development Block Grant) funding.DIS_POP: How this data created?This polygon data is created by intersecting 2020 census block group polygons, LA Country incorporated city and unincorporated community polygons and the 2021 supervisorial district polygons. The resulting polygon boundary aligned and matched with the legal city boundary whenever possible. Data created: 2024 August
Copyright Text: Census Bureau, Los Angeles County Internal Services Department (ISD), Los Angeles County Department of Public Work (DPW).
This polygon boundary data is created by ISD - GIS Section.
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Description: This data is the product of 2020 census tracts split by 2024 incorporated city boundaries and unincorporated community/countywide statistical areas (CSA) boundaries and 2021 Supervisorial District boundaries. The split census tract boundaries have been altered and aligned where necessary with legal city boundaries and unincorporated areas, including along shoreline/coastal areas. This data is also known as the Split Tract data. Census Tract:The Census Bureau (https://www.census.gov/)released 2020 geographic boundaries data including census tracts for the analysis and mapping of demographic information across the United States. City Boundary:City Boundary data is the base map information for the County of Los Angeles. These City Boundaries are based on the Los Angeles County Seamless Cadastral Landbase. The Landbase is jointly maintained by the Los Angeles County Assessor and the Los Angeles County Department of Public Works (DPW). This layer represents current city boundaries within Los Angeles County. The DPW provides the most current shapefiles representing city boundaries and city annexations. True, legal boundaries are only determined on the ground by surveyors licensed in the State of California.Countywide Statistical Areas (CSA): The countywide Statistical Area (CSA) was defined to provide a common geographic boundary for reporting departmental statistics for unincorporated areas and incorporated Los Angeles city to the Board of Supervisors. The CSA boundary and CSA names are established by the CIO and the LA County Enterprise GIS group worked with the Los Angeles County Board of Supervisors Unincorporated Area and Field Deputies that reflect as best as possible the general name preferences of residents and historical names of areas. This data is primarily focused on broad statistics and reporting, not mapping of communities. This data is not designed to perfectly represent communities, nor jurisdictional boundaries such as Angeles National Forest. Low and Moderate Data:The low- and moderate-income summary data (LMISD) based on the American Community Survey 2016-2020 5-year estimates(2020 ACS) published by U.S. Department of Housing and Urban Development HUD).Data Field:UniqueID: ID field (combination of 2020 census tract number, 2024 city/community and 2021 supervisorial District number)CT20: 2020 Census TractCTLABEL: census tract number with two decimal placesCOMMNAME: Legal city name or unincorporated area nameSUP: 2021 supervisorial district numberLOW: Number of persons with family income less than 50% of the Area Median Income (AMI)MOD (moderate): Number of persons with family income at least 50% but less than 80% of the AMILOWMOD: Sum of LOW and MOD / number of persons with family income less than 80% of the AMILOWMODUNIV: Number of persons with the potential for being deemed LOW or MOD. Use as denominator for calculating percentageLOWMOD_PCT: The percentage of persons who are of low/moderate income; calculated by LOWMOD/LOWMODUNIV times 100POP_TOT: Number of people from 2020 ACS 5YR Summary File (TabID B01001)PARTICIPANT: Incorporated cities and unincorporated communities participating the CDBG (Community Development Block Grant) funding.DIS_POP: How this data created?This polygon data is created by intersecting 2020 census tract polygons, LA Country incorporated city and unincorporated community polygons and the 2021 supervisorial district polygons. The resulting polygon boundary aligned and matched with the legal city boundary whenever possible. Data created: 2024 August:
Copyright Text: Census Bureau, Los Angeles County Internal Services Department (ISD), Los Angeles County Department of Public Work (DPW).
This polygon boundary data is created by ISD - GIS Section.
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Description: The State Assembly Districts layer contains polygons for 2003 California State Assembly Districts. The source for the information in this layer is the Los Angeles Registrar/Recorder's Precinct Information File (PIF), which is designed to match the Thomas Brothers TRNL (road network) layer.
Where boundaries are defined by streets, water, city boundaries, or other features, those arc segments are copied to the districts layer, so that the boundaries and other layer features match perfectly.
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Description: The State Senate Districts layer contains polygons for California State Senate Districts. The source for the information in this layer is the Los Angeles Registrar/Recorder's Precinct Information File (PIF), which is designed to match the Thomas Brothers TRNL (road network) layer.
Where boundaries are defined by streets, water, city boundaries, or other features, those arc segments are copied to the districts layer, so that the boundaries and other layer features match perfectly.
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Description: The Us Congressional Districts layer contains polygons for US Congressional Districts. The source for the information in this layer is the Los Angeles Registrar/Recorder's Precinct Information File (PIF), which is designed to match the Thomas Brothers TRNL (road network) layer.
Where boundaries are defined by streets, water, city boundaries, or other features, those arc segments are copied to the districts layer, so that the boundaries and other layer features match perfectly.
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