Growing Pains: What 200 Years of Data Tell Us About How We Grow
Vol. IV, No. 53 - Are we growing too fast? History tells us we are not.
Ask around Troy, Piqua, or Tipp City and you’ll hear a common complaint: things are growing too fast. But two centuries of census records tell a different story — one where today’s growth is modest compared to past surges, and where every big jump or drop in population traces back to a specific cause, not a steady drift.
The Canal Boom
Troy’s most dramatic growth spurt happened in the 1840s, when the population jumped 168.1%, from 504 residents to 1,351. That surge lines up almost exactly with the opening of the Miami-Erie Canal, which came to Miami County up from Dayton in 1837. The canal turned Miami County’s communities from a small dots on a map into a functioning commercial hub almost overnight, pulling in merchants, laborers, and mill operators who needed to be near the new transportation artery. Troy kept growing through the 1850s (44.8%) and 1860s (35.1%) as canal-driven commerce matured, though the pace naturally slowed once the initial infrastructure shock had been absorbed.
Piqua’s canal-era numbers are even more extreme. The city grew 203.3% in the 1840s and then another 121.4% in the 1850s, compounding into a population that went from 488 in 1830 to 3,277 by 1850. Piqua sat at a particularly advantageous point along the canal route, which made it an early manufacturing center for flour milling and other canal-dependent industries. That kind of back-to-back triple-digit growth is something neither Piqua nor Troy has come close to replicating since — a useful reminder that “explosive growth” in Miami County has a very specific historical meaning.
The Industrial Wave
Both cities saw a second major growth wave around 1900. Troy grew 30.9% in that decade and Piqua grew 33.9%, reflecting the broader industrialization sweeping small Midwestern cities at the time. Clothing and undergarment mills opened in Piqua and Hobart first came to Troy from Middletown at the beginning of the 20th Century. Rural residents left farms for factory jobs in nearby towns. This wave was slower and more sustained than the canal-era spike, but it fundamentally reshaped both cities from commercial trading posts into manufacturing towns.
The 1910s Slowdown
Troy’s growth nearly stalled in the 1910s, dropping to just 4.1%, the slowest decade in the city’s recorded history until that point. This slowdown coincides with the run-up to and onset of World War I, which disrupted the labor migration and immigration patterns that had fueled industrial growth in the prior decade. Piqua’s 1910s growth held up better at 10.0%, suggesting Troy was more exposed to whatever local economic disruption was happening at the time, though the exact local cause is harder to pin down from the numbers alone.
The Postwar Suburban Boom
The biggest sustained growth wave for both Troy and Tipp City came in the 1960s and 1970s. Troy grew 28.4% in the 1960s and another 25.6% in the 1970s. Tipp City grew 29.1% and 19.3% in those same decades. This was the postwar suburban boom playing out at the local level — returning veterans, the Baby Boom generation, GI Bill mortgages, and perhaps even most consequential — Interstates. All these factors combined to push people out of dense urban cores and into newly built single-family neighborhoods. Piqua’s growth during this period was noticeably weaker (10.2% and 7.9%), which is an early hint of the divergence that would define Piqua’s next fifty years.
While Troy and Tipp City kept growing through the late 20th century, Piqua’s population essentially flatlined and then began shrinking. Piqua lost population in the 1980s (-1.3%), the 2010s (-1.0%), and the 2020s (-0.8%), and grew by less than 1% in the 1990s and 2000s. This pattern tracks closely with Ohio’s broader deindustrialization story. The manufacturing plants that had made Piqua a boomtown around 1900 closed or downsized over the following decades, and residents increasingly moved to newer housing stock in Troy or Tipp City rather than staying in an aging urban core with a shrinking job base. Piqua is the clearest example in Miami County of population decline tracking directly with the loss of the economic engine that created the growth in the first place.
Tipp City’s most dramatic modern growth spike came in the 2000s, when the population jumped 53.0%, from roughly 6,000 residents to over 9,200. That’s the largest single-decade increase any of these three communities has recorded since the canal era. Unlike the canal-driven booms of the 1840s, though, this growth came from new subdivision development and expanded housing stock built to attract commuters working elsewhere in the Dayton metro area, rather than from a local industry or transportation shift driving people to move there for work.
What the Full Picture Shows
Looking at all three communities together, a clear pattern emerges: population growth in Miami County has never been gradual. It comes in sharp bursts tied to a specific trigger — a canal, an industrial wave, a postwar housing boom — separated by long stretches of slower, more modest change. Troy’s growth over the past decade, by comparison to its own 200-year record, is unremarkable. The 5.0% increase between 2010 and 2020 is close to Troy’s historical baseline rather than an outlier, even though it’s the number generating the most local anxiety right now.
Piqua’s long decline is really the flip side of the same coin. When Troy and Tipp City gained residents through new housing in the postwar decades, some of that gain came at Piqua’s expense, as residents chose newer neighborhoods over an aging industrial city with fewer jobs. That’s worth remembering the next time someone in Miami County complains about growth — the real question isn’t whether the numbers are big, historically they usually aren’t, but where that growth is landing and what it’s replacing.
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