About the National Public Opinion Baseline Survey (NPORS)

NPORS is an annual survey of American adults conducted by the Pew Research Center. Respondents may respond in writing, online, or by telephone. They are selected using address-based sampling from the U.S. Postal Service’s Computerized Delivery Sequential File. Respondents are not required to join a survey panel. Pew Research Center uses NPORS to produce benchmark estimates on a variety of topics, such as Americans’ political and religious affiliations. Read a detailed description of how the investigation is conductedas well as More information on how the Center uses NPORS.

Comparison of the NPORS index with other survey data

NPORS estimates, which are based on responses to paper, online and telephone surveys, may differ somewhat from historical Pew Research Center polling data. There are several reasons why differences may occurThe Center has published analyses of how the survey mode can influence estimates of Political Views And religious attitudes and behaviors.

Membership in a political party

The latest NPORS estimates are presented below. The Center also provides an in-depth analysis of trends in political party affiliation.

Religious affiliation

The latest NPORS estimates are presented below. The Center also provides an in-depth analysis of tendencies in religious affiliation as well as in the analysis of the size And attitudes many religious denominations in the United States