Pew Research Center Sep. 22, 2011

How many U.S. residents were missed in the census?

Senior research staff answer questions from readers relating to all the areas covered by our seven projects, ranging from polling techniques and findings, to media, technology, religious, demographic and global attitudes trends.

Aug. 25, 2011

How Accurate Are Counts of Same-Sex Couples?

Two decades after the Census Bureau began offering people the option to describe themselves as a same-sex “unmarried partner,” producing accurate numbers on same-sex couples remains a challenge.

May. 4, 2011

Imputation: Adding People to the Census

When census-takers can’t reach anyone at a particular address or obtain information about occupants in other ways, they sometimes use a last-resort statistical technique called “imputation” to fill in missing data. One marker of the quality of a census is how much it relies on imputation to add people to the count.

Apr. 22, 2011

Census 2010: Household Size Trends

The average size of U.S. households has been declining for decades, but new Census data may show a reversal of that trend.

Apr. 18, 2011

How Good is the 2010 Census Count? An Update

In addition to publishing detailed numbers from the 2010 Census, the Census Bureau has been releasing performance indicators from the count. They offer clues to help answer the question of how well the bureau did in counting the entire U.S. population, only once, and in the right place.

Apr. 6, 2011

Challenging the Census

Now that 2010 Census numbers have been released for every place in the United States, a number of local officials — including the mayors of New York and Detroit — have announced plans to file administrative challenges to counts that they contend are too low. What sorts of challenges are allowed?

Apr. 6, 2011

Multi-Race and the 2010 Census

When final national race counts from the 2010 Census were released last month, they included more than nine million Americans who self-identified as belonging to two or more race groups. One of them was not President Barack Obama.

Hispanic Mar. 15, 2011

How Many Hispanics in the U.S.?

The number of Hispanics counted in the 2010 Census has been larger than expected in most states for which the Census Bureau has released detailed population totals so far, with the widest gaps in states with relatively small Hispanic populations.

Pew Research Center Feb. 23, 2011

Does the Census double count “snowbirds”?

Senior research staff answer questions from readers relating to all the areas covered by our seven projects, ranging from polling techniques and findings, to media, technology, religious, demographic and global attitudes trends.

Feb. 22, 2011

Who Are the People in Your Neighborhood?

People who turn to the Census Bureau’s latest data release in an effort to answer Sesame Street’s musical query may, in some cases, be puzzled by what they find. The detailed race, ethnicity and population counts make it easy to look up data for any block in America. But those numbers may not be completely accurate — and deliberately so.