Voting in primaries and caucuses from abroad

Yes, you can vote in primaries from abroad. The catch is that primaries run on party rules as well as state rules, so a couple of extra details on your paperwork make the difference.

The short version

Primaries for federal office are federal elections, so the overseas voter protections apply: your ballot must go out at least 45 days ahead, and the backup Federal Write-In Absentee Ballot is accepted [1].
The FPCA (Standard Form 76) has a box for your political party for primary elections. Many states need it to send you a primary ballot [2].
States run open, closed or semi-closed primaries. Which one you have decides whether you need to register with a party [3].
Caucuses are run by the parties, not the state, and absentee options vary by party and state.
Democrats Abroad runs a Global Presidential Primary for its members. Republicans Overseas doesn't run a primary of its own and points voters to FVAP and their state's process [5][6].

Why primaries deserve your attention

By the time November comes around, the field is down to the nominees. The primaries are where that field gets narrowed: for President, but also for the House, the Senate, governor and plenty of local offices. In some districts, the primary is the race that decides who ends up in office.

Plenty of Americans abroad who vote every November miss the primaries simply because they didn't plan for them. Primary season starts early in a presidential year, and the paperwork has one extra box. Get those two things right and you're in.

What federal law guarantees

The Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA) applies to "elections for Federal offices," and the MOVE Act of 2009 extended its ballot procedures to all federal elections [1]. In practice, that means a primary for President, the Senate or the House gets the same core protections as November:

45-day ballot delivery. States must send your ballot at least 45 days before the election, if your request arrived by then, unless the Defense Department grants a hardship waiver [1].
Electronic delivery of blank ballots. States must offer an electronic way to get your blank ballot [1].
The FWAB. UOCAVA requires states to accept the Federal Write-In Absentee Ballot in all elections for federal office [1]. If your primary ballot hasn't shown up close to the deadline, it's your backup.
Ballot tracking. States must give you a free way to check that your ballot was received [1].

What federal law doesn't do is set the primary dates or decide who may vote in which party's primary. That's up to the states and the parties.

Open, closed or semi-closed: why it matters

FVAP sorts primaries into three broad types [3]:

Primary type	Who can vote	What it means for you abroad
Open	Any registered voter picks one party's primary, regardless of affiliation	Usually no party registration needed, but you still choose one party's ballot
Closed	Only voters registered with that party	You typically need to name your party on your registration form
Semi-closed	Party members vote in their own primary; unaffiliated voters choose one	Registered party members are locked to their party's ballot

Two points hold everywhere: "A voter may only vote in one party's primary," and states vary in how they run open primaries for absentee voters [3]. Some states also use their own systems, such as a single primary ballot for all candidates. Look up your state on FVAP before you assume.

The party box on the FPCA

Section 5B of the FPCA asks: "What is your political party for primary elections?" The form explains: "Many states require you to specify a political party to vote in primary elections. This information may be used to register you with a party" [2].

What to keep in mind:

Leaving it blank can mean no primary ballot. FVAP's guides for Iowa and Pennsylvania both say that to vote in a primary, you must name the party ballot you want [4][7]. Both also say you don't need a party to get a general or special election ballot.
It can register you with that party. The form says so plainly [2]. If you want to stay unaffiliated, read your state's rules first.
It's tied to the calendar year. The FPCA covers at least the federal elections of the year you send it, and states like Iowa and Pennsylvania want a new one each year and after any address change [4][7]. If you want to switch parties for 2028, your January 2028 FPCA is the place to do it, subject to any state cutoff for party changes.
Your voter category still counts. If you checked "intent to return is uncertain," some states only give you federal races, which can mean a shorter primary ballot [2][7].

How to vote in a primary from abroad, step by step

Find your state's primary dates. Check your state election office or your state's FVAP page early in the year. Presidential primaries often come earlier than primaries for Congress and state offices.
Send your FPCA in early January. Count back 45 days from your state's primary to see how much time you really have. For an early primary, that can be mid-January.
Fill in the party box if your state requires it or you want a specific party's ballot [2].
Ask for email or online ballot delivery to save a trip through international mail [2].
Watch for the ballot in your inbox and spam folder around 45 days out.
Return it the way your state requires. Iowa, for example, says overseas citizens outside a hostile fire area must return the voted ballot by mail [4]. Pennsylvania's ballots go back by mail too [7]. Some states accept email or fax.
Use the FWAB if time runs short and your ballot still isn't there [1].
Check that it arrived using your state's ballot tracking tool.

Caucuses: party-run contests

A caucus is a meeting run by a political party, where members gather in person to pick candidates or delegates. Some parties in some states use caucuses or other party-run contests instead of, or alongside, a state-run primary. Which states use them changes from cycle to cycle.

For overseas voters, caucuses are the trickiest part of the calendar, for a simple reason: they're built around showing up in person, like a town hall meeting in a school gym. Some parties have offered absentee, remote or tele-caucus options in past cycles; others haven't. Because the party sets the rules, the usual UOCAVA tools may not fit neatly:

Ask the state party, early. The state party organization announces the caucus rules and any remote options for its own members.
Check with your election office too. If your state also holds a state-run primary, the FPCA route still applies to that.
Know your registration. Caucuses usually require party membership or registration, so your party status in the state matters.

We don't list caucus states here because the lineup for 2028 wasn't settled when we wrote this. Check your state party's website when the calendar is announced.

The party groups abroad

Both major parties have organizations for Americans living overseas. Here's how each fits into primary season, described side by side.

Democrats Abroad holds a Global Presidential Primary every four years for its members, and sends delegates to the Democratic National Convention to reflect the result [5]. In 2024, eligibility required being a US citizen living abroad, 18 or older by Election Day, a Democrats Abroad member, and not voting in another state's presidential primary. Voters could choose in-person voting centers or remote ballots. A member who votes for the presidential nomination in the Global Primary can still vote in their home state's primary, but only for other races such as Congress, state and local offices [6]. The 2028 details weren't published when we wrote this.

Republicans Overseas doesn't run a presidential primary of its own. Its voting page directs Americans abroad to FVAP and their local election officials, explains the FPCA, and recommends the FWAB as a backup for federal offices [8]. Republican voters abroad take part in the nomination through their home state's Republican primary or caucus, using the FPCA process described above.

Both groups run voter registration drives and events for Americans abroad. Neither replaces your state election office, which is where your actual registration and ballot live.

Primaries and caucuses from abroad: picking the nominees from overseas