More and more solo entrepreneurs are raking in $1 million. Here are the industries where business is booming.

• Thousands more one-person businesses are hitting million-dollar revenues and may keep growing.
• From 2020 to 2021, the number of such businesses grew from 47,000 to 58,000, driven by the pandemic.
• Professional, scientific, and technical services led, followed by construction and finance.

Thousands more one-person businesses are reaching the coveted million-dollar earnings number — and it may continue to rise.