To find the city where technology startup businesses are thickest on the ground, look no further than the Valley. Both Chandler and Mesa rank among the Top 10 for cities with the most tech startups — computers, software, medical devices and electronics — per capita.

That is one of the striking findings of a ranking of U.S. cities by technology startups per capita. Another is that none of the Top 10 tech startup hotbeds lies east of the Mississippi River. Silicon Valley boasts three, Southern California has another and the rest scatter across Texas, Arizona, Nevada and Washington.

The data and analysis came from SizeUp, a San Francisco–based provider of free business intelligence for small and mid-sized businesses. SizeUp CEO and cofounder Anatalio Ubalde sifted through millions of records from a plethora of sources to build it. He and his team identified companies less than five years old in the fields of computers, software, medical devices and electronics that were located in the top 100 cities by population.

Here are the top 10 cities for the most tech startups and the number of startups they have per 100,000 population:

1. Fremont, CA, 21.3
2. San Jose, CA, 10.1
3. Irving, TX, 6.5
4. Chandler, AZ, 5.1
5. Austin, TX, 4.5
6. Paradise, NV, 3.9
7. Anaheim, CA, 3.8
8. Mesa, AZ, 3.7
9. Seattle, WA, 3.5
10. Santa Ana, CA, 3.3