Delaware County, OH

Settlement & growth (pre-1960)

Before American settlement, the land that is now Delaware County was primarily hunting and trading territory of the Wyandot and Lenape (Delaware) nations, for whom the county and its seat are named. The region was sparsely populated by these groups, who were gradually pushed out by European-American expansion following the Treaty of Greenville in 1795 and the War of 1812. The first permanent white settlers, primarily of English and Scots-Irish stock, arrived from Pennsylvania, Virginia, and Kentucky in the first decade of the 1800s, drawn by the promise of cheap, fertile land in the Ohio Country. They established the first settlements along the Olentangy and Scioto Rivers, founding the town of Delaware in 1808 and the village of Sunbury in 1816.

The 19th century saw a steady trickle of German immigrants, who formed a significant portion of the farming population in the county’s rural townships, particularly around the villages of Ostrander and Kilbourne. These communities were characterized by tight-knit Lutheran and Catholic congregations and a strong agricultural work ethic. The arrival of the railroads in the 1850s, including the Cleveland, Columbus & Cincinnati line, transformed the county by connecting its farmers to larger markets and spurring the growth of small industrial towns like Ashley and Galena. For much of this period, Delaware County remained a quiet, overwhelmingly white, Protestant agricultural area, with the city of Delaware serving as the commercial, governmental, and educational hub, anchored by Ohio Wesleyan University (founded 1842). The population grew slowly but steadily, reaching roughly 30,000 by 1900, and remained almost entirely native-born white.

The first half of the 20th century brought little demographic change. The county did not experience the large-scale immigration from Southern or Eastern Europe that transformed industrial cities like Cleveland or Youngstown. Its economy remained tied to agriculture and the small-scale manufacturing that supported it. The Great Depression and World War II saw out-migration of young people to industrial centers, and the county’s population actually declined slightly between 1940 and 1950. The post-war boom began to change this, as the rise of automobile ownership and the construction of U.S. Route 23 and Interstate 71 made the southern part of the county accessible to commuters working in Columbus. By 1960, the population had crept back up to around 36,000, but the county was still fundamentally a rural, agricultural community on the cusp of transformation.

Modern era (post-1965)

The modern demographic story of Delaware County is not one of international immigration driven by the 1965 Hart-Cellar Act, but rather of explosive domestic migration and suburbanization. The county’s population began its meteoric rise in the 1980s and 1990s as Columbus’s economy diversified and expanded, pulling middle-class and upper-middle-class families northward. The construction of the Polaris Centers of Commerce in southern Orange and Delaware Townships in the 1990s was the single most transformative event. This massive mixed-use development, anchored by major corporate headquarters and retail, turned the southern tip of the county into a premier employment and commercial hub. The villages of Powell and the city of Westerville (which straddles the Franklin County line) became the primary destinations for this wave of domestic migrants, who were overwhelmingly white, college-educated, and seeking large new homes in top-rated school districts like Olentangy Local Schools.

This domestic influx has been so dominant that it has shaped the county’s racial and ethnic composition. The white population remains very high at 80.4%, a figure that reflects the county’s status as a destination for white flight from Columbus and as a draw for white professionals from across the Midwest. The Black population is just 4.1%, and the Hispanic population is 3.3%, both well below national averages. The most notable non-white demographic shift has been the arrival of a highly educated Indian-subcontinent population, which now stands at 4.9% of the county. This community is heavily concentrated in the southern part of the county, particularly in the newer subdivisions of Dublin (which extends into the county’s southwest corner) and the Polaris area, drawn by high-paying jobs in technology, finance, and healthcare at companies like JPMorgan Chase, Nationwide Insurance, and Hewlett Packard Enterprise. The East and Southeast Asian population (3.0%) follows a similar pattern, clustering in the same southern suburbs for the same professional reasons. The foreign-born population remains low overall at 4.2%, but it is highly concentrated and affluent, a stark contrast to the immigrant enclaves of older industrial cities.