Overall
- Boise City
- 98.4
- Decatur
- 88.4
Diff -10.0 RPP
Boise City vs Decatur
Cost of living comparison based on BEA Regional Price Parities. Decatur is 10.1% less expensive than Boise City.
10.1% less expensive
Decatur, IL is 10.1% less expensive than Boise City, ID on BEA Regional Price Parities (overall RPP 88.4 vs 98.4). A $100,000 salary in Boise City buys about the same as $89,868 in Decatur; the largest component gap is rents.
- Overall RPP 98.4 (Boise City) vs 88.4 (Decatur)
- $100k in Boise City ≈ $89,868 purchasing power in Decatur
- Rents drives the gap (-49.4 RPP points)
RPP parity plate
Pair ID:IL 98.4→88.4
TIER-GAP · CROSS-STATE · SPLIT-BUDGET · BOTH-BELOW · PP-SHIFT
- TIER-GAP Clear tier gap
- CROSS-STATE ID × IL
- SPLIT-BUDGET Split budget
- BOTH-BELOW Both below 100
- PP-SHIFT PP shift
Instrument codes from this pair's BEA Regional Price Parities (overall · goods · services · rents · national benchmark 100 · purchasing-power conversion), not a ranking or recommendation.
Category Breakdown
Goods
- Boise City
- 96.2
- Decatur
- 93.6
Diff -2.5 RPP
Services
- Boise City
- 70.7
- Decatur
- 91.1
Diff +20.4 RPP
Rents
- Boise City
- 105.6
- Decatur
- 56.2
Diff -49.4 RPP
| Category | Boise City | Decatur | Difference |
|---|---|---|---|
| Overall | 98.4 | 88.4 | -10.0 |
| Goods | 96.2 | 93.6 | -2.5 |
| Services | 70.7 | 91.1 | +20.4 |
| Rents | 105.6 | 56.2 | -49.4 |
Visual Comparison
Overall
Boise City 98.4
Decatur 88.4
Goods
Boise City 96.2
Decatur 93.6
Services
Boise City 70.7
Decatur 91.1
Rents
Boise City 105.6
Decatur 56.2
Vertical line = national average (100)
What This Comparison Actually Tells You
Rents creates the largest separation: Decatur is 49.4 points lower. But services move against the overall direction, so this is a split budget rather than a clean across-the-board winner.
Boise City, ID and Decatur, IL sit in clearly different price tiers, separated by 10.0 RPP points. At this distance, treating the same nominal salary as equivalent would materially change purchasing power.
Both metros remain below the U.S. benchmark of 100. This comparison chooses between two below-average price levels; “more expensive” here does not mean nationally expensive.
Comparable population context is incomplete for this pair, so no market-scale explanation is inferred from the price indexes.
For a housing-sensitive move, validate the rent gap first: HUD Fair Market Rent and the actual unit size can overturn what the blended index implies. On the BEA ratio alone, $100,000 in Boise City corresponds to $89,868 in Decatur.
Boise City
98.4
Cost Index
Decatur
88.4
Cost Index
Salary Equivalents
What a salary in Boise City would need to be in Decatur for the same purchasing power:
| In Boise City | In Decatur | Difference |
|---|---|---|
| $50,000 | $44,934 | $-5,066 |
| $75,000 | $67,401 | $-7,599 |
| $100,000 | $89,868 | $-10,132 |
| $150,000 | $134,802 | $-15,198 |
$ in Boise City = in Decatur
Same BEA Regional Price Parity ratio as the table above (98.4 → 88.4), computed live from your number, nothing is sent anywhere.
How the Price Gap Changed
Boise City and Decatur share 17 published annual releases from 2008 through 2024. Their overall gap widened, moving from 4.2 to 10.0 RPP points. Boise City remained the higher-index metro in the latest release.
Rents changed the most within this pair: its gap moved 12.0 points between the first and latest shared releases (37.4 to 49.4 points). This describes a relative price-index history, not a forecast or a household budget.
| Release Year | Boise City RPP | Decatur RPP | Relative Gap |
|---|---|---|---|
| 2008 | 95.3 | 91.0 | 4.2 points Boise City higher |
| 2012 | 96.7 | 93.0 | 3.6 points Boise City higher |
| 2016 | 93.2 | 88.9 | 4.2 points Boise City higher |
| 2020 | 93.6 | 88.3 | 5.4 points Boise City higher |
| 2024 | 98.4 | 88.4 | 10.0 points Boise City higher |
Annual BEA Regional Price Parity releases; a higher index means a higher price level relative to the national average of 100. Selected years shown from the full shared series.
Frequently Asked Questions
Is Decatur more expensive than Boise City?
Decatur is 10.1% less expensive than Boise City. The overall cost index is 88.4 vs 98.4 (national average = 100).
What salary in Decatur equals $100K in Boise City?
A $100,000 salary in Boise City has the same purchasing power as $89,868 in Decatur. This is based on the BEA Regional Price Parity indexes.
How do rents compare between Boise City and Decatur?
Rents in Boise City are indexed at 105.6 while Decatur is at 56.2 (national average = 100). Boise City has higher rents.
Data sources
- BEA Regional Price Parities (RPP), the cost-of-living indices shown on this page
- U.S. Census Bureau, American Community Survey (ACS), gross-rent observations behind the rents component
- BLS Consumer Price Index (CPI), goods and services price relatives
- BLS Occupational Employment and Wage Statistics (OEWS), labor-driven services component
- HUD Fair Market Rents (FMR), 40th-percentile rent cross-reference
Every figure on PlainCost is rendered directly from BEA Regional Price Parity source data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, our changelog, or report a data error. Data current as of 2026-08-11. Rankings measure the published cost-of-living index only; we don't recommend where to live or rate any metro's quality of life.