Uber Eats is the fastest-growing meal delivery service in the U.S., bringing in nearly as much newcustomer revenue as GrubHub.

People are now spending more on Uber Eats than on any other food delivery service in nine of the 22 most-populous U.S. cities, according to data from Second Measure, a company that analyzes billions of dollars worth of anonymized debit and credit card purchases.

Six months ago, Uber Eats dominated in just three Texas cities: Houston, Austin and Dallas. In the time since, it’s beaten out GrubHub in El Paso, DoorDash in Fort Worth and Postmates in Phoenix, and even Amazon Restaurants in Amazon’s home city of Seattle.

However, this isn’t necessarily an example of Uber Eats eating GrubHub’s lunch (or that of other services). Rather, the market for food delivery is growing fast enough that the competitors have plenty of business to gain — and not just from each other. Overall food delivery sales grew 51 percent from August to March, according to Second Measure.

Recently, Postmates and DoorDash discussed a merger as a way to fight back against GrubHub (which includes Seamless and Eat24) and Uber Eats, which dwarf them in market share. Combined, they’d have a 24 percent market share — bigger than Uber Eats.

Here’s how the market share looks by city: