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United States

Official bilingual or trilingual States and Territories

Hawaii (English and Hawaiian)
The Constitution of the State of Hawaii, article XV, section 4

American Samoa (English and Samoan)
American Samoa Constitution, article I, section 3

The Commonwealth of the Northern Mariana Islands (English, Chamorro et Carolinian)
The Constitution of the Commonwealth of the Northern Mariana Islands, article XXII, section 3

Nota : The Guam territory (English and Chamorro) and Puerto Rico (English and Spanish) seems to be officialy bilingual but we haven't found any Acts, Regulations or Constitutional section to that effect on the world wide web.

Official unilingual States

Alabama
Constitution of Alabama – 1901, amendment 509 (English as Official Language of State)

Alaska
Alaska Ballot Measure 6

Arizona
Arizona Constitution, Article 28, section 2
Texte complet

Arkansas
Arkansas Code Annotated, Section 1-4-117
(There are no official version on the web at the moment.)

California
California State Constitution, Article 3, section 6, subsection B
(At the creation date of this page, the official web site of the State of California was not accessible.)

Colorado
Constitution of the State of Colorado, article 2, section 30a (official version)
Version with a better overall view

Florida
Constitution of the State of Florida, Article 2, section 9

Georgia
Official Code of Georgia, Section 50-3-100

Idaho
Idaho Statutes, Title 73 General Code Provisions Chapter 1, article 121

Illinois
State Designations Act, (5 ILCS 460/20)

Indiana
Indiana Code, IC 1-2-10-1

Iowa
Iowa Code, 1.18 Iowa English Language Reaffirmation

Kansas
Kansans Statutes, 73-2801 Official Language

Kentucky
Kentucky Revised Statutes, Chapter 2.013

Mississippi
Mississippi Code of 1972, 3-3-31

Missouri
Constitution of Missouri, Article 1, section 34

Montana
Montana Code Annotated 2009, 1-1-510

Nebraska
Nebraska State Constitution, Article I-27

New Hampshire
New Hampshire Statutes, 3-C:1

North Carolina
General Statutes, Chapter 145-12

North Dakota
Century Code, 54-02-13

Oklahoma
Oklahoma Constitution, Section XXX-1

South Carolina
South Carolina Code of Laws (Unannotated), section 1-1-696 à 698

South Dakota
South Dakota Codified Laws, chapter 1-27-20

Tennessee
Tennessee Code, 4-1-404

Utah
Utah Administrative Code, R765-136-3

Virginia
Code of Virginia, 1-511

Wyoming
Wyoming Statutes, 8-6-101

Others

New Mexico (English and Spanish)
H.Con.Res.11 - Entitled the "English Plus Resolution"

Louisiana (English and French)
Louisiana Constitution of 1974, article XII, section 4

Revised Statutes - Title 43 Public printing and advertisements (RS 43:204)