Equivalency Tables

Download equivalency tables for correlating various geographic boundary systems.

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2000 FAZ to 2000 TAZ
Counties	faztaz00_cnty
Region	faztaz00_reg	faztaz00_reg

2000 FAZ to 2000 Census Tract
Counties	fazct00_cnty
Region	fazct00_reg

2000 Census Tract to 2000 TAZ
Counties	cttaz00_cnty
Region	cttaz00_reg	cttaz00_reg

2000 FAZ Group to 2000 FAZ
King County	fazgrp00_kin
Kitsap County	fazgrp00_kit
Pierce County	fazgrp00_prc
Snohomish County	fazgrp00_sno
Region		fazgrp00_reg

2000 TAZ to 1991 TAZ
Counties
Region		taz00_taz91

2000 Census Tract – Block Group – Block – TAZ – FAZ
Region		equiv2000 (8.4 mb)

1991 FAZ to 1991 TAZ
King County	faztaz91_kin
Kitsap County	faztaz91_kit
Pierce County	faztaz91_prc
Snohomish County	faztaz91_sno

1991 FAZ to 1990 Census Tract
King County	faz91ct90_kin
Kitsap County	faz91ct90_kit
Pierce County	faz91ct90_prc
Snohomish County	faz91ct90_sno

1990 Census Tract to 1991 TAZ
King County	ct90taz91_kin
Kitsap County	ct90taz91_kit
Pierce County	ct90taz91_prc
Snohomish County	ct90taz91_sno

1990 Census Tract – Block Group – Block –TAZ (1991) – FAZ (1991)
Region		equiv1900 (6.6 mb)

What is a Traffic Analysis Zone (TAZ)?
- TAZs are the units of the geographic boundary system used by the PSRC to run and report results from its Travel Demand Forecast Model. The TAZs nest within a larger Forecast Analysis Zone (FAZ) geographic boundary system, with each FAZ containing between 1 and 20 TAZs. TAZ boundaries generally, with few exceptions, also line up with census tract boundaries, with each census tract containing between 1 to 9 TAZs. There are a total of 938 TAZs in the region.

What is a Census Block Group?
- A block group (BG) is a cluster of census blocks within a census tract that have the same first digit of the four-digit block identifying number. For example, block group 3 (BG 3) within a census tract includes all blocks numbered from 3000 to 3999. Block groups generally contain between 600 and 3,000 people, with an optimum size of 1,500 people. A census tract can contain between 1 to 9 block groups.

What is a Census Block?
- Census blocks are the smallest unit within the geographic boundary system used by the U.S. Census Bureau to collect, tabulate, and present decennial census and other data. They are defined by both physical features (e.g. streets, roads, streams, and railroad tracks) as well as invisible boundaries (e.g. city, town, and county limits; property lines; and imaginary extensions of streets and roads.) They may or may not contain a population. All Census Bureau geographic reporting areas are built upon the census block.

What is a Census Designated Place (CDP)?
- CDPs are unincorporated communities that are identifiable by name, with concentrations of population, housing and commercial structures. They are delineated for each decennial census for reporting purposes, and are the statistical counterparts of incorporated municipalities. CDP boundaries may change from one decennial census to the next.

What is a Forecast Analysis Zone (FAZ)?
- FAZs are the units of the geographic boundary system used by the PSRC to model and report its small area Forecasts of Population, Households, and Employment. They are built up from traffic analysis zones (TAZs), with each FAZ containing between 1 to 20 TAZs. FAZ boundaries generally, with few exceptions, also line up with census tract boundaries, with each FAZ containing between 1 to 9 census tracts. There are a total of 219 FAZs in the region.

What is a Traffic Analysis Zone (TAZ)?
- TAZs are the units of the geographic boundary system used by the PSRC to run and report results from its Travel Demand Forecast Model. The TAZs nest within a larger Forecast Analysis Zone (FAZ) geographic boundary system, with each FAZ containing between 1 and 20 TAZs. TAZ boundaries generally, with few exceptions, also line up with census tract boundaries, with each census tract containing between 1 to 9 TAZs. There are a total of 938 TAZs in the region. What is a Census Tract?