Get a primer on how to vote today and what to look for as election results roll in tonight.

HERE’ S WHAT YOU NEED TO KNOW BEFORE VOTING

STAFF WRITERS Despite record turnout during early voting, more than 1 million registered Harris County voters have yet to cast a ballot in this year’s general election. Here’s what you need to know before heading to the polls Tuesday:

■ Registration: Texas does not allow same-day registration, so new voters must be registered to vote already. Voters can check their registration status at hctax.net/Voter/Search or VoteTexas.gov.

■ Polling sites: The county will have more than 800 polling sites on Tuesday, which can be found at harrisvotes.com. Residents can vote in their home precinct or any other location. In addition to poll location and maps, the county’s website includes an online tool to help voters track wait times and find the shortest lines.

Polls are open from7 a.m. to 7 p.m. If you are in line at 7 p.m., you will be able to vote if you stay in line.

■ Identification: Voters must bring an acceptable form of photo identification to the polls. These include a Texas driver’s license, a Department of Public Safety-issued personal ID card, a DPS-issued election ID certificate, a DPS-issued handgun license, a United State military ID, a passport, or a citizenship certificate containing your photo.

The ID may be expired no more than four years, although voters over 70 can use the ID regardless of howlong it has been expired.

If you do not have and cannot obtain one of those IDs, you can fill out a declaration at the polls claiming a “reasonable impediment.” Then you must show an alternative ID, including: a government document with your name and address, such as your voter registration certificate, a current utility bill, bank statement, government check, paycheck, certified birth certificate or a document confirming birth admissible in a court of law.

■ Mail ballots: People who have not submitted their mail ballots yet can drop them off Tuesday at NRGPark or at one of the clerk’s annex facilities between 7 a.m. and 7 p.m. Gov. Greg Abbott’s order limiting counties to one drop-off location only applied to early voting, according to tthe clerk’s office. Voters must have their ID and only can drop off mail ballots for themselves. Those who received a mail ballot but want to vote in person must surrender their mail ballots at the polling site to ensure they do not try to cast more than one ballot.

■ Phones: People cannot use their phones while in the voting booth, so bring notes or a printout if you need reference material. And skip the selfie.

■ Who’s on the ballot?: There are dozens of races at nearly every level of government, from the presidency and U.S. Senate to county clerks and school board trustees. You can check who will be on your ballot at harrisvotes.com/SampleBallots, and the Chronicle’s “VoterGuide” is available at houstonchronicle.com.

■ Questions and issues:

The county has an election hotline at 713-755-6965.

■ Other counties: Residents in neighboring counties can find links to information from their voter registrar’s office at the Secretary of State’s website, sos.state.tx.us.