The 13th largest metro area by population, Arizona's Valley of the Sun is also home to 93 companies on this year's Inc. 5000. With key industry sectors including manufacturing, defense and technology, Phoenix's booming economy continues to hinge on the historic "5 Cs": Cotton, Cattle, Citrus, Climate and Copper. Even so, HR, software, security and more made significant strides.

By looking at private companies' three-year revenue growth, between 2010 and 2013, Inc. has tallied the fastest-growing companies across the country. Here are the top 10 fastest-growing companies in Phoenix:

10. Western Window Systems

Established back in 1959, this manufacturer is known for its' innovative product designs. Led by CEO Jason Funk, Western Window Systems boasts an impressive three-year growth rate of 236 percent, snagging number 1,762 on this year's Inc. 5000

9. QDI Stone

QDI Stone, an importer and distributor of stone flooring, tiles, and more, clocks in at number 1,627 on the overall Inc. 5000. QDI is also the 9th fastest-growing startup in Phoenix. With CEO Arif Surmen at the helm, the company's three-year growth rate is 262 percent. 

8. AZ Tech Finders

One of the hottest HR recruiting firms in Phoenix landed at number 1,626 on this year's Inc. 5000, with a three-year growth rate of 262 percent. Founded in 1998, this small company is led by CEO Sharon Bondurant. You'll appreciate their slogan: "Talkin' Nerdy since '98."

7. Desert Care Landscape Resources

The name, Desert Care Landscape Resources, may speak for itself, but so too does good word of mouth, which this company has in spades. Founded in 2009, the 7th fastest-growing company in Phoenix boasts a sizeable three-year growth rate of 322 percent. Under the leadership of CEO Jeff Meyer, the startup now claims the 1,341 spot on this year's Inc. 5000.

6. VincentBenjamin 

Another fast growing, Phoenix-based HR startup, VincentBenjamin recruits employees in a number of professional sectors, incluing HR, Accounting, Financial Services and more. With a thee-year growth rate of 361 percent, the company, which is headed by CEO Ben Howard, ranked at number 1,210 on the Inc. 5000.

5. Inilex 

Led by CEO Michael Maledon, Inilex--a security company that uses GPS technology to track stolen vehicles--has flourished since its' founding in 2003. With a three-year growth rate of 422 percent, this company is ranked at number 1,056 on the overall Inc. 5000.

4. VCA

The 4th fastest-growing company in Phoenix is a business products and services startup named VCA. Under the leadership of CEO Christie Acevedo, VCA can tout an impressive 438 percent revenue growth rate between 2010 and 2013. That helped land the 10-year-old company on the Inc. 5000 at number 1,056. 

3. Owens Harkey Advertising 

This marketing agency, ranking at number 812 on the overall Inc. 5000, is the third fastest-growing company in Phoenix. Headed by CEO Scott Harkey, the company's three-year growth rate is a whopping 561 percent. Owens Harkey claims to "kill it in the digital space," and it looks like its customers agree.

2. Clear Title Agency of Arizona

This real-estate firm--a provider of title and escrow services--is the 2nd-fastest growing company in Phoenix, and with a 680 percent three-year growth rate, it's also number 671 on this year's Inc. 5000. Founded in 2007, Clear Title made its way onto Inc.’s radar under the leadership of CEO James Patterson.

1. WebPT 

With a three-year growth rate of 1,316 percent, WebPT isn't just the fastest-growing company in Phoenix, it hit number 362 on this year's overall Inc. 5000. The six-year-old company provides cloud-based electronic medical record systems for physical therapy clinics. Led by CEO Paul Winandy, the company's tag line is: "The ultimate EMR for physical therapists."

Arizona's desert capital certainly doesn't lack for hot startups. Is Phoenix a destination for your next business venture? Visit the Inc. 5000 Arizona index for more examples of rapidly growing, Phoenix-based companies.