Pekin, IL: what USGS's seismic model says
USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Pekin in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Pekin in the 41th percentile nationally for seismic hazard - higher than 41% of the 4,875 US cities USGS was checked against here.
How Pekin compares
USGS's underlying values for Pekin: 0.065g peak ground acceleration, 0.137g at short period, 0.079g at 1 second. Within Illinois alone, Pekin ranks 138 of 330 cities by seismic hazard - the 58th percentile in-state. Pekin has a population of about 31,266.
Bracing and bolting: the actual cost
A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Illinois specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Illinois.
What this means for insurance
A Pekin homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.
Where Pekin's figures come from
Pekin's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Pekin.