In the past 10 years, the number of U.S. small businesses owned by women rose by 42 percent to 7.7 million nationwide, according to a recent survey by MasterCard.

Over the same period, the total number of all small businesses grew by 23 percent.

Taken together, women-owned firms currently generate some $1.9 trillion in annual sales and employ nearly 13 million workers. About a quarter had between $1 million and $5 million last year.

Survey results were based on responses from 400 women entrepreneurs.