| County | Iron Furnaces | Iron Forges | Corn Mills | Saw Mills | Fulling Mills | Paper Mills | Oil Mills | Population c.1779 | # of Mills per Household* |
| Philadelphia County | 4 | 107 | 53 | 9 | 15 | 1 | 55,455 | 66 | |
| Bucks County | 1 | 52 | 23 | 4 | 1 | 1 | 18,463 | 45 | |
| Chester County | 2 | 4 | 90 | 90 | 19 | 1 | 1 | 21,016 | 21 |
| Lancaster County | 1 | 5 | 191** | 35,493 | 34 | ||||
| York County | 1 | 46 | 29 | 5 | 2 | 30,748 | 75 | ||
| Cumberland County | 84** | 24,279 | 58 | ||||||
| Northampton County | 2 | 44 | 15,495 | 70 | |||||
| Berks County | 4 | 9 | 149** | 22,900 | 31 | ||||
| Bedford County | 11 | 7 | 7,095 | 78 |
Mills in 1800: 62 Paper, 25 Powder, 1900 total Grist
Mill Owners at Pennsylvania Constitutional Convention
(as Delegates):
- 3 of the 138 who voted for ratification: John Arndt (Northampton), David Desler (Northampton), Richard Downing (Chester).
- 5 of the 18 who voted against: Richard Bard (Cumberland), John Bishop (Berks), Abraham Lincoln (Berks), Nicholas Lotz (Berks), John Ryenolds (Cumberland).
