About Mason

A combination of location, skilled leadership, and a close-knit traditional community have resulted in a progressive, polished city with a comfortable hometown feel..



Deerfield Township’s name is derived from its many former “deer licks” - springs that had a saline content that supported a large deer population in the area. The township lies in the former Symmes or Miami Purchase. Early settlement dates from the late 1790s. The township was established on May 10, 1803.

Originally the township included more than half of Turtlecreek Township, all of Union Township, and all of Salem Township north of the Little Miami River. Today, Deerfield Township occupies the southwest portion of Warren County. It is the most heavily developed township in the county.

During the first 40 years of its existence, “Overseers of the Poor” were elected. Their function was to see to the welfare of the township citizens who were unable to make a living. The “Overseers,” in essence, “sold” the care of these citizens to the lowest bidder. The buyers were then responsible for these citizens for a year. The township also had a practice for some years of expelling those it thought would commit crimes and/or become a burden on it. The township would issue warrants on these individuals telling them to leave it.

In the early 1800s, the township was such an important crossroads for travel and commerce that road building, linking it to Cincinnati and points elsewhere, began soon after it was established. Later in the 19th century, an organization was formed called “The Horse Rangers.” Its mission was the maintenance of the laws of the township, the detection of villainy and outlawry and the pursuit of the perpetrators. The group recovered over 20 stolen horses and most of those involved in their thefts. This resulted in similar group’s creation in the Twenty Mile Stand area in the southern part of the township.

William Mason, a Revolutionary War veteran, purchased a square mile of land in 1815 and platted it as Palymra. After his death, the name of the town was changed to Mason. It was incorporated as a village in 1840. Over the years, Mason grew quite substantially, covering more than 11,000 acres. It was incorporated as a city in 1971 and in 1997 it withdrew from the township.

The company that would become the King Powder Company and Peters Cartridge Company began around 1850 by Ahimaaz King. By 1878, it relocated to an area a few miles east of Mason in the sheltered valley of the Little Miami River. Mr. King built a complete village, Kings Mill, for his workers, with homes and schools for their families. During its period of operation, the company experienced several major explosions and large fires. The factories closed in 1958.

Fast Facts1

  • Warren County is the second fastest growing county of Ohio's 88 counties. In 1990, there were 11,500 residents. In 2010, there were 30,700 residents, a 167% increase.

  • Recently ranked the second fastest growing city in Ohio, the 2011 population is estimated to be 31,039.

  • Warren County is ranked as the nation's 172th (out of 3,141) most affluent (county), placing it among the top three percent of the counties in the United States. It is ranked as the third most affluent county in the State of OH.

  • Median household income is almost $89,569; per capita income hit $37,948. The average home sells for $213,887. And 44 percent of workers there have management or professional jobs.

  • The Mason City School District is an "Excellent" district, and earned the highest state ranking for eleven consecutive administrations of the Ohio Report Card. The district is one of only 14 other districts to achieve this honor continuously. The district scored a perfect 26 out of 26 on the 2010-11 Report Card.




Annual average temperature - 54 degrees
July average maximum temperature - 86 degrees
January average temperature - 21 degrees
Annual average rainfall - 34"
Annual average snowfall - 29"


Mason City Schools
10,900 students in five public schools
An “Excellent with Distinction” district on the Ohio Department of Education and Local Report Card

3 private schools
Royalmont Academy – Catholic, PreK though 8, 200 students
St. Susanna School – Catholic, K through 8, 725 students
Mars Hill Academy – Christian, K through 12, 300 students

Courseview Campus Center of Sinclair Community College is in Mason. At least a dozen other schools are within commuting distance


700 - 950 feet above sea level


Deerfield Township’s housing stock is dominated by large and high-value single-family homes on lots between 0.25 acre and one acre, built within the last 10 to 20 years
The median home value is $213,887
Home values range from around $70,000 to $2 million
There are several apartment communities and three senior living facilities


22 miles northeast of Cincinnati
30 miles south of Dayton
Centrally located between Interstates 71 and 75
Just a few miles north of I-275


7 city parks cover 301 acres that include baseball fields, basketball courts, disc golf course, fishing lakes, football fields, hiking trails, picnic shelters, playgrounds, soccer fields, softball fields, a swimming pool, tennis courts, volleyball courts, and wildlife areas.

Places of Worship

    About two-dozen facilities represent over a dozen denominations


1980 Census - 8,692
1990 Census - 11,452
2000 Census - 22,019
2004 Census estimate - 27,958
2006 Census estimate - 29,491
2010 Census - 30,712
2011 Census estimate - 31,039


The average new single-family residence in Mason contains 4 bedrooms, 2 1/2 baths and approximately 6,600 square feet (including garages and unfinished basements). The median value of this single-family house and lot was estimated to be about $500,000 in 2011.


135 miles of roadway 150 miles of storm sewers 150 miles of water and sewer line


Grocery and drug stores, specialty shops, professional service providers (physicians, lawyers, dentists, insurance agents, etc.), restaurants and fast food, banks, hardware, and many other products and services can be found in Mason. Five regional shopping centers are within 20 miles via the interstates. Eight hospitals are within 25 miles.


17.65 square miles
11,298 acres


1Source: imaginemason.org