The United States of America doesn’t have an official language on the federal level. They do use English as the primary language for official documents and publications, legislation, orders, regulations and rulings.
The states with English as the only official language are:
Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Louisiana, Massachusetts, Mississippi, Missouri, Montana, Nebraska, New Hampshire, North Carolina, North Dakota, South Carolina, South Dakota, Tennessee, Utah, Virginia and Wyoming.
Puerto Rico has declared Spanish the principal language, but both English and Spanish are official languages.
In the US Virgin Islands, only English is official, while American Samoa has English and Samoan.
Guam has English and Chamorro has official languages and in the Northern Mariana Islands, English, Chamorro and Carolinian are official.