Across the region, the highest average increase was in Middlesex County—my new(ish) home—at 17.0%, followed by Grey (16.3%) and Bruce (15.8%) Counties and Guelph (15.5%), with Waterloo Region (15.3%) and Huron County (14.8%) close behind.
(In the MPAC announcement, Brant-Haldimand-Norfolk were lumped together with a range of 8.3% to 10.3% for the three. I used the mid-point for the graph.)
Windsor was at the other end of the scale with a 0.3% increase, followed by Sarnia at 1.8%.
In Ontario, the highest reported increase was in Timiskaming, where assessments were up an average 36.8%. But that doesn't come close to the increases for farmland:
The value of farmland has skyrocketed in Southwestern Ontario over the last four years, with the biggest increases coming in Chatham-Kent (65.6%) and Huron County (65.3%). The Brantford area (64.0%) and Lambton County (62.2%) were also right up there.