SCAG develops socioeconomic estimates and growth projections
including population, households, and employment for cities and
transportation analysis zones in the SCAG region through enhanced
forecasting methods and interactive public outreach. These
estimates and projections provide the analytical foundations for
SCAG’s transportation planning and other programs.
The transportation planning area covers 191 jurisdictions and six
unincorporated communities in Southern California. This region is
divided into over 11,000 small areas. These small areas are known
as the Tier 2 Transportation Analysis Zone (TAZ) system. This
zone system is uniquely designed to allow highly detailed traffic
analysis and predictions through the use of SCAG’s sophisticated
Population, household and employment estimates, and forecasts are
maintained at the jurisdictional and county unincorporated level.
Secondary variables including population, household and
employment characteristics, single and multiple households, or
employment by sectors, are further estimated and projected at the
Tier 2 level.
This provides SCAG, in great geographical detail, current and
future demographic profiles of the region. These profiles are key
inputs to SCAG’s transportation model, which uses them to help
estimate current and future transportation conditions.