Oak Park, IL: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Oak Park is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Oak Park in the 38th percentile nationally for seismic hazard - higher than 38% of the 4,875 US cities USGS was checked against here.

How Oak Park compares

The raw figures: peak ground acceleration 0.061g, short-period spectral response 0.12g, 1-second spectral response 0.063g. Among 330 Illinois cities in this dataset, Oak Park ranks 220 for seismic hazard, the 33th percentile within the state. About 52,947 people live in Oak Park, Illinois.

What a retrofit costs in Oak Park

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Illinois. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Oak Park address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Oak Park's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.