Holbrook, AZ has a population of 5,011 and is the 6,463rd largest city in the United States. The population density is 289 per sq mi which is 403% higher than the Arizona average and 219% higher than the national average. The median age in Holbrook is 34 which is approximately 7% lower than the Arizona average of 37. In Holbrook, 48% of the population over 15 years of age are married, 78% speak English and 10% speak Spanish. 58% of Holbrook residents were born in Arizona, 37% were born out of state, 1% were born outside of the United States and 5% were foreign born.