Over the following years, the city continued to grow, with the population increasing to 20,292 in 1920 and 36,818 in 1940.In 2006, the population of Pima County, in which Tucson is located, passed one million, while the City of Tucson's population was 535,000.
A separate Convento settlement was founded downstream along the Santa Cruz River, near the base of what is now "A" mountain.
Most notable, however, were the two holdups committed by masked road-agent William Whitney Brazelton.
Brazelton held up two stages in the summer of 1878 near Point of Mountain Station approximately 17 mi (27 km) northwest of Tucson. to send special agent and future Pima County sheriff Bob Paul to investigate.
The city is located 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U. Tucson is the 33rd largest city and the 53rd largest metropolitan area in the United States.
Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown.