Bond Field Guide Fixed income. Clear perspective.
Methodology

State of Illinois

IL-ST A-
4 bonds Maturities 2028–2056 Yield 4.08%–4.75% GO
Yield by maturity, % as of Oct 15, 2026
State of Illinois indicative yield to maturity by maturity, in percent (model), as of Oct 15, 2026: 2-year 4.08%, 5-year 4.22%, 10-year 4.41%, 30-year 4.75%. U.S. Treasury par curve: 2-year 4.77%, 5-year 4.91%, 10-year 5.10%, 30-year 5.43%.4.08%4.75%2Y30Y
IL-ST, indicative YTM, pre-tax (model) U.S. Treasury par
Representative sample. These bonds illustrate State of Illinois's curve; full per-CUSIP coverage and real last-trade prices require a market-data feed. Prices are indicative (Treasury curve + our model credit spread for the rating), not market quotes. See Methodology.
BondCoupon Maturity Yield (YTM) Rating Spread model Price indic. Duration
IL-ST 3.25% ’28
General obligation
 3.25% Oct 15, 2028 4.08% A- -68 bp 98.424 1.9 yr
IL-ST 3.50% ’31
General obligation
 3.50% Oct 15, 2031 4.22% A- -68 bp 96.804 4.5 yr
IL-ST 3.75% ’36
General obligation
 3.75% Oct 15, 2036 4.41% A- -63 bp 94.689 8.2 yr
IL-ST 4.25% ’56
General obligation · callable
 4.25% Oct 15, 2056 4.75% callable A- -60 bp 92.054 16.3 yr

Bond identity is shown as issuer-coupon-maturity shorthand (e.g. IL-ST 4¾ ’34), not a CUSIP, because CUSIP display requires a separate licence. Yields are indicative; a high spread reflects our model's credit-risk assumption for the rating, not a market-observed level.