The major party filing period for congressional races will end in six states over the next week. These include:
• New Jersey and South Carolina: March 30
• Missouri and South Dakota: March 31
• New York and Tennessee: April 2

All six states will hold U.S. House elections for each of their congressional districts. In addition, New Jersey, South Carolina, South Dakota, and Tennessee will hold elections for one seat each in the U.S. Senate.

These filing deadlines have so far not been moved in response to the coronavirus pandemic. Ballotpedia is tracking changes to election dates and procedures.

The general election in each state is scheduled for November 3, 2020. The primaries in New Jersey and South Dakota are scheduled for June 2. The remaining primaries are scheduled as follows:
• South Carolina: June 9
• New York: June 23
• Missouri: August 4
• Tennessee: August 6

These filing deadlines are the 26th through the 31st to take place in the 2020 election cycle. The next statewide filing deadline is on April 6 in Arizona.

Entering the 2020 election year, the U.S. Senate has 45 Democrats, 53 Republicans, and two independents who caucus with the Democratic Party. Only 33 out of 100 Senate seats are up for regular election, and two are up for special election. A majority in the chamber requires 51 seats. The U.S. House has 232 Democrats, 197 Republicans, five vacancies, and one independent. All 435 seats are up for election. A majority in the chamber requires 218 seats.

Additional reading:
United States House of Representatives elections, 2020
United States Senate elections, 2020
Changes to election dates, procedures, and administration in response to the coronavirus (COVID-19) pandemic, 2020
Ballotpedia’s Elections Analysis Hub, 2020