Seneca County Population 2017

Seneca County's estimated population is 55,353 with a growth rate of -0.41% in the past year according to the most recent United States census data. Seneca County is the 47th largest county in Ohio.

Year Population Growth Growth Rate
201655,353-226-0.41%
201555,579-178-0.32%
201455,757-69-0.12%
201355,826-212-0.38%
201256,038-396-0.70%
201156,434-192-0.34%
201056,626-3,107-5.20%
199059,733-2,168-3.50%
198061,9011,2051.99%
197060,6961,3702.31%
196059,3266,34811.98%
195052,9784,4799.24%
194048,4995581.16%
193047,9414,76511.04%
192043,1767551.78%
191042,4211,2583.06%
190041,1632940.72%
189040,8693,92210.62%
188036,9476,12019.85%
187030,827-41-0.13%
186030,8683,76413.89%
185027,1048,97649.51%
184018,12812,969251.39%
18305,1590.00%

Seneca County Population Growth

Population Data via

Seneca County Race Data

Race Population Percentage
White52,59095.01%
Black or African American1,4132.55%
Two or More Races9911.79%
Asian4160.75%
American Indian and Alaska Native1500.27%
Native Hawaiian and Other Pacific Islander190.03%

Seneca County Population Pyramid

0k1k1k2k2kSeneca County Male Population0k1k1k2k2kSeneca County Female Population

Population of Cities in Seneca County

City 2010 Census 2016 Estimated Growth Growth Rate
Tiffin1796117545-416-2.32%
Fostoria1345313279-174-1.29%
Green Springs13661315-51-3.73%
Bloomville956924-32-3.35%
Attica899874-25-2.78%
Bettsville656632-24-3.66%
Republic549526-23-4.19%
New Riegel249244-5-2.01%
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990