A promise to tell the truth.
Federal Law
includes affirmation, and “sworn” includes affirmed 1 USC 1
State Law
Alabama
includes affirmation Alabama Code 1-1-1
Alaska
includes affirmation Alaska Statutes 10.06.990, Alaska Statutes 15.80.010
includes affirmation or declaration Alaska Statutes 01.10.060
Arizona
includes an affirmation or declaration Arizona Laws 1-215
California
includes affirmation California Water Code 16, California Harbors and Navigation Code 17, California Welfare and Institutions Code 16, California Health and Safety Code 17, California Insurance Code 17, California Labor Code 16, California Business and Professions Code 20, California Military and Veterans Code 15, California Elections Code 335, California Corporations Code 16, California Public Resources Code 16, California Public Utilities Code 15, California Streets and Highways Code 17, California Financial Code 16, California Fish and Game Code 60, California Vehicle Code 16, California Government Code 15
includes affirmation and written certification or declaration subscribed to be true under penalty of perjury California Unemployment Insurance Code 16
includes affirmation and written declarations signed under the penalties of perjury California Revenue and Taxation Code 17
includes affirmation or declaration under penalty of perjury California Evidence Code 165
includes an affirmation or declaration California Code of Civil Procedure 17
Connecticut
shall include affirmations in cases where by law an affirmation may be used for an oath, and, in like cases, the word “swear” shall include the word “affirm” Connecticut General Statutes 1-1
Delaware
includes affirmation in all cases where an affirmation may be substituted for an oath, and “sworn” includes affirmed; and the forms shall be varied accordingly Delaware Code Title 1 Sec. 302
shall mean a promise of truthfulness that is a solemn, spoken pledge to a Supreme Being Delaware Code Title 29 Sec. 4321
Florida
includes affirmations Florida Statutes 1.01
Hawaii
includes a solemn affirmation Hawaii Revised Statutes 1-21
Illinois
shall be deemed to include an affirmation, and the word “sworn” shall be construed to include the word “affirmed Illinois Compiled Statutes 5 ILCS 70/1.12
Indiana
includes “affirmation” and “to swear” includes to “affirm” Indiana Code 1-1-4-5
Iowa
includes affirmation in all cases where an affirmation may be substituted for an oath, and in like cases the word “swear” includes “affirm” Iowa Code 4.1
Kansas
includes an affirmation in all cases where an affirmation may be substituted for an oath, and in similar cases “swear” includes affirm Kansas Statutes 77-201
Kentucky
means an affirmation or other legally authorized manner of attesting to the truth of a statement Kentucky Statutes 523.010
Maine
includes an affirmation, when affirmation is allowed Maine Revised Statutes Title 1 Sec. 72
Michigan
shall be construed to include the word “affirmation” in all cases where by law an affirmation may be substituted for an oath; and in like cases the word “sworn” shall be construed to include the word “affirmed” Michigan Laws 8.3k
Minnesota
includes “affirmation” in all cases where by law an affirmation may be substituted for an oath; and in like cases “swear” includes “affirm” and “sworn” “affirmed Minnesota Statutes 645.44
Missouri
a notarial act, or part thereof, that is legally equivalent to an affirmation and in which an individual at a single time and place:

(a) Appears in person before the notary Missouri Laws 486.600

Montana
includes an affirmation or declaration Montana Code 1-1-201
Nebraska
shall include affirmation Nebraska Statutes 32-112
shall include affirmation in all cases in which an affirmation may be substituted for an oath Nebraska Statutes 49-801
New Hampshire
shall include “affirmation” in all cases where by law an affirmation may be substituted for an oath; and, in like cases, the word “sworn” shall include the word “affirmed New Hampshire Revised Statutes 21:24
New Jersey
includes “affirmation New Jersey Statutes 1:1-2
North Carolina
shall be construed to include “affirmation” in all cases where by law an affirmation may be substituted for an oath, and in like cases the word “sworn” shall be construed to include the word “affirmed North Carolina General Statutes 12-3
North Dakota
includes “affirmation” North Dakota Code 1-01-49
includes an affirmation North Dakota Code 29-01-13
Ohio
includes affirmation, and “swear” includes affirm Ohio Code 1.59
Rhode Island
includes affirmation; the word “sworn” includes affirmed; and the word “engaged” includes either sworn or affirmed Rhode Island General Laws 43-3-11
South Dakota
includes affirmation South Dakota Codified Laws 2-14-2
Tennessee
includes affirmation Tennessee Code 1-3-105
means a solemn and formal undertaking to tell the truth and includes an equivalent affirmation permitted by law as a substitute for an oath administered by a person authorized by law to take statements under oath Tennessee Code 39-16-701
Texas
includes affirmation Texas Government Code 311.005, Texas Penal Code 1.07
Utah
includes “affirmation Utah Code 68-3-12.5
Vermont
shall include affirmation where by law an affirmation may be substituted
Virginia
includes affirmation Virginia Code 1-228
shall include “affirmation Virginia Code 47.1-2
Washington
includes an affirmation and every other mode authorized by law of attesting to the truth of that which is stated; in this chapter, written statements shall be treated as if made under oath if:
Washington Code 9A.72.010
West Virginia
shall be deemed to include an affirmation and the word “swear” or “sworn” to be complied with if the person referred to make solemn affirmation West Virginia Code 2-2-7
Wisconsin
includes affirmation in all cases where by law an affirmation may be substituted for an oath Wisconsin Statutes 990.01