The white supremacist group Identity Evropa more than doubled the number of its chapters.
The violent neo-Nazi organization Atomwaffen Division grew from one chapter to 27.
The white nationalist group and podcasting site The Right Stuff boasted 34 chapters.
American hate groups had a bumper year in 2018 as a surge in black and white nationalist groups lifted their number to a new record high, the Southern Poverty Law Center said in a report issued Wednesday.
The Alabama-based legal advocacy organization recorded 1,020 active hate groups last year, up 7 percent from 2017. The previous record tallied by SPLC was 1,018 in 2011 amid a white extremist backlash against the presidency of Barack Obama, the nation's first African-American president.
The increase was driven by growth in both black and white nationalist groups, the SPLC said. The number of white nationalist groups jumped from 100 to 148, while the number of black nationalist groups — typically anti-Semitic, anti-LGBTQ and anti-white — rose from 233 to 264.
The SPLC defines a hate group as "an organization that, based on its official statements or principles, the statements of its leaders, or its activities, has beliefs or practices that attack or malign an entire class of people, typically for their immutable characteristics."
The number of hate groups has grown every year for the past four years, the SPLC said, a 30 percent increase roughly coinciding with President Donald Trump's election campaign and presidency. The increase followed three years of decline toward the end of the Obama administration.
Hate crimes have followed a similar trajectory in recent years. After falling for three consecutive years, attacks on blacks, Jews, Muslims and other minorities increased by 30 percent in the three-year period ending in 2017, according to the latest FBI data.