Although she will not appear on the ballot until 2018, U.S. Sen. Elizabeth Warren has already collected more than 8 million for her re-election bid since January -- bringing her campaign balance to just over $11 million, officials reported Friday.

The Massachusetts Democrat, known for her prodigious fundraising, pulled in about $3.45 million in contributions for her 2018 run during the period spanning April to the end of June, according to her campaign, which reported the data prior to its release by the Federal Election Commission.

That amount, which comes in addition to the $5.2 million she raised in the first three months of 2017, includes contributions from nearly 9,400 Massachusetts residents, her campaign reported.

Nearly all -- or about 98 percent -- of money given to Warren's re-election campaign in the second-quarter of 2017 came from contributions of $100 or less, officials added.

The senator touted the support she received from Massachusetts residents on Twitter, calling the number of in-state contributors "one incredible stat."

We’re almost done tallying our Q2 fundraising, but here’s 1 incredible stat: Nearly 9400 ppl in MA donated to our campaign in Q2. #mapoli pic.twitter.com/RVI90VyE51 — Elizabeth Warren (@ewarren) July 12, 2017

Warren added that she's "deeply grateful for everyone in (Massachusetts) who is a part of our grassroots team."

"This isn't just my fight -- it's yours, too," she posted on the social media website earlier this week.

I'm deeply grateful for everyone in MA who is a part of our grassroots team. This isn't just my fight - it's yours, too. Thank you! #mapoli — Elizabeth Warren (@ewarren) July 12, 2017

Officials with the Democrat's campaign did not release the total number of donors to Warren's re-election bid or how much it spent between April and June.

They, however, reported that Warren now has a campaign balance of more than $11 million -- up from $9.2 million as of the end of March and $4.8 million as of the end of 2016.

The senator's second-quarter fundraising came as she traveled the state and country promoting her latest book, "This Fight Is Our Fight: The Battle to Save America's Middle Class."

Warren also hosted several town hall-style events during the fundraising period, including in Lowell last month, Ware in May and Salem in April.

Despite her reported campaign balance and contributions from across Massachusetts, several candidates have announced bids to challenge Warren's 2018 re-election.

State Rep. Geoff Diehl, R-Whitman; Entrepreneur Shiva Ayyadurai, of Cambridge; Allen Rodney Waters, of Mashpee; Darius Mitchell, of Lowell; and Heidi Wellman, of Braintree, have all filed paperwork with the Federal Election Commission to run as Republicans for the Massachusetts Senate seat in 2018.

John P. Devine, of Woburn, has also filed papers to run as an independent candidate for Senate.