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State-by-State Statutes on All-Mail Elections
Alaska: Elections other than general, party primary or municipal (Alaska Stat.§15.20.800)
Arizona: Special districts may conduct elections by mail (Ariz. Rev. Stat. Ann. §16-558)
Arkansas: Primary elections in which only one candidate has filed for the position by a filing deadline and there are no other ballot issues to be submitted for consideration (Ark. Stat. Ann. §7-7-313)
California: After/on January 1, 2018, fourteen counties may conduct all-mail elections. After January 1, 2020, any county may conduct any election as an all-mail election following statutory guidelines. (Cal. Elec. Code §3017, 4005-4008). When there are 250 or fewer voters registered to vote in a precinct (Cal. Elec. Code §3005); local, special or consolidated elections that meet certain criteria (Cal. Elec. Code §4000).
Colorado: All elections (CRS §1-5-401)
Florida: Referendum elections at the county, city, school district or special district level (Fla. Stat. §101.6102) Also, governor may call for a mail ballot election after issuing an executive order declaring a state of emergency or impending emergency (see S 866, 2008)
Hawaii: Any federal, state, or county election held other than on the date of a regularly scheduled primary or general election (HRS §11-91.5). In 2018, Hawaii passed house bill 1401, which authorizes a county with a population less than 100,000 to conduct a pilot program for the 2020 primary and general elections.
Idaho: A precinct which contains no more than 125 registered electors at the last general election may be designated by the board of county commissioners a mail ballot precinct no later than April 1 in an even-numbered year (Idaho Code §34-308)
Kansas: Nonpartisan elections at which no candidate is elected, retained or recalled and which is not held on the same date as another election (KSA Stat. §25-431 et seq.)
Maryland: Special elections (Md. Election Code §9-501 et seq.)
Minnesota: Elections conducted by a municipality having fewer than 400 registered voters on June 1 of an election year and not located in a metropolitan county (Minn. Stat. §204B)
Missouri: Nonpartisan issue elections at which no candidate is elected, retained or recalled and in which all qualified voters of one political subdivision are the only voters eligible to vote (Mo. Rev. Stat. §115.652 et seq.)
Montana: Any election other than a regularly scheduled federal, state, or county election; a special federal or state election, unless authorized by the legislature; or a regularly scheduled or special election when another election in the political subdivision is taking place at the polls on the same day (MCA 13-19-101 et seq.)
Nebraska: Special ballot measure elections that meet certain criteria, held by a political subdivision (NRS §32-952)
Nevada: Whenever there were not more than 20 voters registered in a precinct for the last preceding general election (NRS §293.213)
New Jersey: A municipality with a population of 500 or fewer persons, according to the latest federal decennial census, may conduct all elections by mail (NJRS §19.62-1)
New Mexico: Any bond election, any election on the imposition of a mill levy or a property tax rate for a specified purpose or any special election at which no candidates are to be nominated for or elected to office (NMSA §1-23-1 et seq.)
North Dakota: Counties may conduct any election by mail (ND Cent. Code §16.1-11.1-01 et seq.)
Oregon: All elections (ORS §254.465)
Utah: Jurisdictions may decide to conduct elections entirely by mail (Utah Code Ann. §20A-3-302)
Washington: All elections (WRC §29A.40)
Wyoming: Counties may decide to conduct special elections entirely by mail (Wyo. Stat. 22-29-115)