This data was collected by the the U.S. Census, describing the National population change and certain estimated components of the population change from April 1, 2000 to July 1, 2004.  This was released in December of 2004 and the observations are sorted alphabetically by states.  The Population Estimates Program publishes total population estimates annualy.  Other publications they do through the internet also also includes demographic components of change (births, deaths, and migration).  The estimates they have are usually are for the present and the past, while the projections are estimates of the population for future dates. They developed these estimates with the guidance of the Federal State Cooperative Program for Population Estimates (FSCPE).

These estimates are used in federal funding allocations, as the denominators for vital rates and per capita time series, as survey controls, and in monitoring recent demographic changes.


The variables are in the order of the following:


VARIABLE 			DESCRIPTION

SUMLEV				Geographic Summary Level
REGION				Census region code
DIVISION			Census division code
STATE				State FIPS code
STNAME				State name
CENSUS2000POP			4/1/2000 resident total Census 2000 population
ESTIMATESBASE2000		4/1/2000 resident total population estimates base
POPESTIMATE2000			7/1/2000 resident total population estimate
POPESTIMATE2001			7/1/2001 resident total population estimate
POPESTIMATE2002			7/1/2002 resident total population estimate
POPESTIMATE2003			7/1/2003 resident total population estimate
POPESTIMATE2004			7/1/2004 resident total population estimate
BIRTHS2000			Births in period 4/1/2000 to 7/1/2000
BIRTHS2001			Births in period 7/1/2000 to 7/1/2001
BIRTHS2002			Births in period 7/1/2001 to 7/1/2002
BIRTHS2003			Births in period 7/1/2002 to 7/1/2003
BIRTHS2004			Births in period 7/1/2003 to 7/1/2004
DEATHS2000			Deaths in period 4/1/2000 to 7/1/2000
DEATHS2001			Deaths in period 7/1/2000 to 7/1/2001
DEATHS2002			Deaths in period 7/1/2001 to 7/1/2002
DEATHS2003			Deaths in period 7/1/2002 to 7/1/2003
DEATHS2004			Deaths in period 7/1/2003 to 7/1/2004
INTERNATIONALMIG2000		Net international migration in period 4/1/2000 to 7/1/2000
INTERNATIONALMIG2001		Net international migration in period 7/1/2000 to 7/1/2001
INTERNATIONALMIG2002		Net international migration in period 7/1/2001 to 7/1/2002
INTERNATIONALMIG2003		Net international migration in period 7/1/2002 to 7/1/2003
INTERNATIONALMIG2004		Net international migration in period 7/1/2003 to 7/1/2004
INTERNALMIG2000			Net internal migration in period 4/1/2000 to 7/1/2000
INTERNALMIG2001			Net internal migration in period 7/1/2000 to 7/1/2001
INTERNALMIG2002			Net internal migration in period 7/1/2001 to 7/1/2002
INTERNALMIG2003			Net internal migration in period 7/1/2002 to 7/1/2003
INTERNALMIG2004			Net internal migration in period 7/1/2003 to 7/1/2004
RESIDUAL2000			Residual for period 4/1/2000 to 7/1/2000
RESIDUAL2001			Residual for period 7/1/2000 to 7/1/2001
RESIDUAL2002			Residual for period 7/1/2001 to 7/1/2002
RESIDUAL2003			Residual for period 7/1/2002 to 7/1/2003
RESIDUAL2004			Residual for period 7/1/2003 to 7/1/2004


There are also some integer values as well:

The key for REGION is as follows:
0 = United States Total 
1 = Northeast
2 = Midwest
3 = South
4 = West

The key for DIVISION code is as follows:
00 = United States Total
01 = New England
02 = Mid-Atlantic
03 = East North Central
04 = West North Central
05 = South Atlantic
06 = East South Central
07 = West South Central
08 = Mountain
09 = Pacific