Tabular data of population by age groups, by ethnic groups and by gender, and the poverty by ethnic groups is attached to the split tract geography to create this split tract with population and poverty data. Split tract data is the product of 2010 census tracts split by 2015 incorporated city boundaries and unincorporated community/countywide statistical areas (CSA) boundaries. The census tract boundaries have been altered and aligned where necessary with legal city boundaries and unincorporated areas, including shoreline/coastal areas.

Census Tract:

Every 10 years the Census Bureau counts the population of the United States as mandated by Constitution. The Census Bureau (https://www.census.gov/)released 2010 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. CSA represent board approved geographies comprised of Census block groups split by cities.

Data Field:

CT10: 2010 Census tract

FIP15: 2015 City FIP Code

CITY: City name for incorporated cities and “Unincorporated” for unincorporated areas (as of July 1, 2015)

CT10FIP15: 2010 census tract with 2015 city FIPs for incorporated cities and unincorporated areas.

SPA12: 2012 Service Planning Area (SPA) number.

SPA_NAME: Service Planning Area name.

HD12: 2012 Health District (HD) number:

HD_NAME: Health District name.

POP15_AGE_0_4: 2015 population 0 to 4 years old

POP15_AGE_5_9: 2015 population 5 to 9 years old

POP15_AGE_10_14: 2015 population 10 to 14 years old

POP15_AGE_15_17: 2015 population 15 to 17 years old

POP15_AGE_18_19: 2015 population 18 to 19 years old

POP15_AGE_20_44: 2015 population 20 to 24 years old

POP15_AGE_25_29: 2015 population 25 to 29 years old

POP15_AGE_30_34: 2015 population 30 to 34 years old

POP15_AGE_35_44: 2015 population 35 to 44 years old

POP15_AGE_45_54: 2015 population 45 to 54 years old

POP15_AGE_55_64: 2015 population 55 to 64 years old

POP15_AGE_65_74: 2015 population 65 to 74 years old

POP15_AGE_75_84: 2015 population 75 to 84 years old

POP15_AGE_85_100: 2015 population 85 years and older

POP15_WHITE: 2015 Non-Hispanic White

POP15_BLACK: 2015 Non-Hispanic African American

POP15_AIAN: 2015 Non-Hispanic American Indian or Alaska Native

POP15_ASIAN: 2015 Non-Hispanic Asian

POP15_HNPI: 2015 Non-Hispanic Hawaiian Native or Pacific Islander

POP15_HISPANIC: 2015 Hispanic

POP15_MALE: 2015 Male

POP15_FEMALE: 2015 Female

POV15_WHITE: 2015 Non-Hispanic White below 100% Federal Poverty Level

POV15_BLACK: 2015 Non-Hispanic African American below 100% Federal Poverty Level

POV15_AIAN: 2015 Non-Hispanic American Indian or Alaska Native below 100% Federal Poverty Level

POV15_ASIAN: 2015 Non-Hispanic Asian below 100% Federal Poverty Level

POV15_HNPI: 2015 Non-Hispanic Hawaiian Native or Pacific Islander below 100% Federal Poverty Level

POV15_HISPANIC: 2015 Hispanic below 100% Federal Poverty Level

POV15_TOTAL: 2015 Total population below 100% Federal Poverty Level

POP15_TOTAL: 2015 Total Population

AREA_SQMIL: Area in square mile

POP15_DENSITY: Population per square mile.

POV15_PERCENT: Poverty rate/percentage.

How this data created?

The tabular data of population by age groups, by ethnic groups and by gender, and the poverty by ethnic groups is attributed to the split tract geography to create this data. Split tract polygon data is created by intersecting 2010 census tract polygons, LA Country City Boundary polygons and Countywide Statistical Areas (CSA) polygon data. The resulting polygon boundary aligned and matched with the legal city boundary whenever possible.

Note:

1. Population and poverty data estimated as of July 1, 2015.

2. 2010 Census tract and 2020 census tracts are not the same. Similarly, city and community boundary are not the same because boundary is reviewed and updated annually.