In 2010, the Census Bureau undertook the decennial census to enumerate the U.S. population, with a mission of counting everyone once, only once, and in the right place. Accurate enumeration of linguistically-isolated households in decennial censuses represents an enormous challenge for the Census Bureau. To meet this challenge, the Census Bureau developed a comprehensive language assistance program, which includes the 2010 Census fulfillment form in the top five non-English languages (Spanish, Chinese, Korean, Russian, and Vietnamese), language assistance guides in 59 languages, and telephone questionnaire assistance in the top five non-English languages.