What Is the Capital of Arizona? Phoenix Facts & History

Arizona

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If you’ve ever wondered what the capital of Arizona is, the answer is Phoenix. It’s been the state capital since Arizona officially joined the Union back in 1912, and today it’s grown into one of the most recognizable cities in the entire country — not just in the Southwest.

Phoenix sits in the middle of the Sonoran Desert in Maricopa County, which puts it right at the center of everything happening in Arizona. It’s the state capital, the largest city, and by a wide margin the most populous state capital in the United States. That combination makes it pretty unique compared to most state capitals, which tend to be mid-sized cities most people have never visited.

Phoenix — Arizona’s Capital City

Phoenix officially became Arizona’s state capital on February 14, 1912, the same day Arizona became the 48th state admitted to the Union. Before that, it had already been named the territorial capital back in 1889, taking over from Prescott. The city’s central location in the Salt River Valley and its fast-growing population made it the obvious choice.

Today, Phoenix is home to the Arizona State Capitol building, where the Governor’s office and the state legislature operate. The metro area now stretches across much of Maricopa County and is home to more than 5 million people, making it the fifth-largest metro in the country. No other state capital in the U.S. comes close to that population.

Why Phoenix Became the Capital of Arizona

Phoenix wasn’t always the center of Arizona’s government. The territorial capital actually moved around a few times — Prescott held it from 1864 to 1867, then Tucson from 1867 to 1877, and then Prescott again from 1877 to 1889. The back-and-forth came down to politics and population, as different parts of the territory jockeyed for influence.

What settled it for Phoenix was simple: growth. The Salt River Valley was fertile, irrigation made large-scale farming possible, and when the railroad arrived in the 1880s, Phoenix’s economic dominance over the rest of the territory was basically locked in. By the time Arizona achieved statehood in 1912, Phoenix was already the biggest and most important city in the territory. The capital designation just made it official.

The Arizona State Capitol Building

The Arizona State Capitol building sits in downtown Phoenix at 1700 W Washington Street. The original building was completed in 1901 — more than a decade before Arizona even became a state — and it features a copper dome that’s become one of the more recognizable landmarks in the city. The copper is a direct nod to Arizona’s history as one of the top copper-producing states in the country. Fun fact: the amount of copper on that dome is the equivalent of about 4.8 million pennies.

The legislature eventually outgrew the original building and moved to adjacent facilities in 1960. The old Capitol is now the Arizona Capitol Museum, which is free to visit and gives a solid walkthrough of how Arizona went from a territory to a state. If you’re spending time in the Phoenix area, it’s worth a stop — especially if you’re already planning to explore other parts of the valley like Scottsdale, just a few miles to the east.

Key Facts About Phoenix, Arizona’s Capital

A few things that stand out about Phoenix as a capital city: it covers roughly 517 square miles, which makes it the largest state capital by land area in the contiguous U.S. It sits at about 1,086 feet above sea level and gets more than 300 sunny days a year — which sounds great until July rolls around and temperatures regularly hit 110°F.

Phoenix is the county seat of Maricopa County, which is the fourth most populous county in the entire country. The city is served by Phoenix Sky Harbor International Airport, one of the busiest airports in the Southwest. Beyond government, Phoenix has become a major hub for tech, healthcare, finance, and tourism — it’s a full economic engine, not just an administrative center. If you’re curious about the climate across the broader metro area, our <a href=”https://azcharged.com/scottsdale-weather/”>Scottsdale weather guide</a> breaks down what to expect month by month throughout the Valley of the Sun.

Frequently Asked Questions About Arizona’s Capital

What is the capital of Arizona? The capital of Arizona is Phoenix. It’s been the state capital since Arizona was admitted to the Union on February 14, 1912, and serves as the seat of state government, home to the Governor’s office and the Arizona Legislature.

Is Phoenix the capital of Arizona? Yes, Phoenix is the capital of Arizona. It became the territorial capital in 1889 and the official state capital at statehood in 1912. It’s also the largest city in the state by a significant margin.

What is the capital city of Arizona? Phoenix is the capital city of Arizona. With a city population over 1.6 million and a metro area topping 5 million, it’s the most populous state capital in the United States — which makes it stand out from most other state capitals around the country.

Was Phoenix always the capital of Arizona? No. Before Phoenix, Arizona’s territorial capital moved between Prescott and Tucson several times. Prescott held the designation from 1864–1867, then Tucson from 1867–1877, then Prescott again from 1877–1889. Phoenix took over as territorial capital in 1889 and became the state capital when Arizona achieved statehood in 1912.

Where is the Arizona State Capitol located? The Arizona State Capitol is at 1700 W Washington Street in downtown Phoenix. The original 1901 building is now a free public museum. The state legislature operates out of adjacent modern buildings within the same Capitol complex.

Exploring the Valley of the Sun? Check out our guides on living, visiting, and getting around Arizona right here on AZ Charged.

Author: Tara Jade

Columnist at AZCharged.com, write about businesses, places, and interesting Arizona facts and stats.

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