Please note: This is a work in progress. Indexes will be added after each year is completed.

1800 Pop. 5,414 Bald Eagle Twp. Loyalsock Twp. Lycoming Twp. Muncy Twp. Muncy Creek Twp. Nipenose Twp. Pine Creek Twp. Tyoga Twp. Washington Twp. Wayne Twp. Williamsport	1810 Pop. 11,006 Athens Twp. Bald Eagle Twp. Burlington Twp. Dunstable Twp. Elkland Twp. Loyalsock Twp. Lycoming Twp. Mifflin Twp. Muncy Twp. Muncy Creek Twp. Nipenose Twp. Pine Creek Twp. Shrewsbury Twp. Smithfield Twp. Ulster Twp. Washington Twp. Wayne Twp. Williamsport Partial On-line-USGenWeb Census Project	1820 Pop. 13,517 Bald Eagle Twp. Brown Twp. Chapman Twp. Dunstable Twp. Elkland Twp. Loyalsock Twp. Lycoming Twp. Mifflin Twp. Moreland Twp. Muncy Twp. Muncy Creek Twp. Nipenose Twp. Pine Creek Twp. Shrewsbury Twp. Washington Twp. Wayne Twp. Williamsport
1830 Pop. 17,636 Adams Twp. Bald Eagle Twp. Brown Twp. Chapman Twp. Cherry Twp. Clinton Twp. Dunstable Twp. Elkland Twp. Fairfield Twp. Franklin Twp. Hepburn Twp. Jackson Twp. Jersey Shore Loyalsock Twp. Lycoming Twp. Mifflin Twp. Moreland Twp. Muncy Boro. Muncy Twp. Muncy Creek Twp. Nippenose Twp. Penn Twp. Pine Creek Twp. Shrewsbury Twp. Washington Twp. Wayne Twp. Williamsport	1840 Pop. 22,649 Brown Twp. Cherry Twp. Clinton Twp. Cummings Twp. Davidson Twp. Elkland Twp. Fairfield Twp. Forks Twp. Franklin Twp. Hepburn Twp. Jackson Twp. Jersey Shore Lewis Twp. Limestone Twp. Loyalsock Twp. Lycoming Twp. Mifflin Twp. Moreland Twp. Muncy Boro Muncy Twp. Muncy Creek Twp. Nippenose Twp. Penn Twp. Plunketts Creek Twp. Shrewsbury Twp. Susquehanna Twp. Washington Twp. Williamsport Wolf Twp.	1850 Pop. 26,257 Anthony Twp. Armstrong Twp. Brown Twp. Cascade Twp. Clinton Twp. Cogan House Twp. Cummings Twp. Fairfield Twp. Franklin Twp. Hepburn Twp. Jackson Twp. Jersey Shore Lewis Twp. Limestone Twp. Loyalsock Twp. Lycoming Twp. McIntyre Twp. MIfflin Twp. Montoursville Moreland Twp. Muncy Twp. Muncy Creek Twp. Nippenose Twp. Penn Twp. Plunkett's Creek Twp. Porter Twp. Shrewsbury Twp. Susquehanna Twp. Washington Twp. Watson Twp. Williamsport Wolf Twp.
1860 Pop. 37,399 Partial On-line-USGenWeb Census Project	1870 Pop. 47,626 Partial On-line-USGenWeb Census Project	1880 Pop. 57,486 Online at LDS: Family Search Internet Genealogy Service
1890 Pop. 70,579 Not On-line	1900 Pop. 75,663 Not On-line	1910 Pop. 80,813 Not On-line