Overall
Diff +15.2 RPP
Decatur vs Salem
Cost of living comparison based on BEA Regional Price Parities. Salem is 17.2% more expensive than Decatur.
17.2% more expensive
Salem, OR is 17.2% more expensive than Decatur, IL on BEA Regional Price Parities (overall RPP 103.6 vs 88.4). A $100,000 salary in Decatur buys about the same as $117,221 in Salem; the largest component gap is rents.
- Overall RPP 88.4 (Decatur) vs 103.6 (Salem)
- $100k in Decatur ≈ $117,221 purchasing power in Salem
- Rents drives the gap (+54.1 RPP points)
RPP parity plate
Pair IL:OR 88.4→103.6
TIER-GAP · CROSS-STATE · RENT-LED · BENCH-CROSS · PP-STEEP
- TIER-GAP Clear tier gap
- CROSS-STATE IL × OR
- RENT-LED Rent-led gap
- BENCH-CROSS Benchmark cross
- PP-STEEP Steep PP convert
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.
Salary Equivalents
What a salary in Decatur would need to be in Salem for the same purchasing power:
| In Decatur | In Salem | Difference |
|---|---|---|
| $50,000 | $58,610 | +$8,610 |
| $75,000 | $87,916 | +$12,916 |
| $100,000 | $117,221 | +$17,221 |
| $150,000 | $175,831 | +$25,831 |
$ in Decatur = in Salem
Same BEA Regional Price Parity ratio as the table above (88.4 → 103.6), computed live from your number, nothing is sent anywhere.
What This Comparison Actually Tells You
Decatur, IL and Salem, OR sit in clearly different price tiers, separated by 15.2 RPP points. At this distance, treating the same nominal salary as equivalent would materially change purchasing power.
This route crosses the national benchmark: Salem is above 100 while Decatur is below it. That makes the move a change of price regime, not merely a rank swap.
Rents leads the difference, with Salem 54.1 points higher than Decatur. Goods, services, and rents all point in the same broad direction, making the headline comparison more transferable across household types.
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 Decatur corresponds to $117,221 in Salem.
Category Breakdown
Goods
Diff +11.6 RPP
Services
Diff +13.6 RPP
Rents
Diff +54.1 RPP
| Category | Decatur | Salem | Difference |
|---|---|---|---|
| Overall | 88.4 | 103.6 | +15.2 |
| Goods | 93.6 | 105.3 | +11.6 |
| Services | 91.1 | 104.7 | +13.6 |
| Rents | 56.2 | 110.3 | +54.1 |
Visual Comparison
Overall
Decatur 88.4
Salem 103.6
Goods
Decatur 93.6
Salem 105.3
Services
Decatur 91.1
Salem 104.7
Rents
Decatur 56.2
Salem 110.3
Vertical line = national average (100)
Decatur
88.4
Cost Index
Salem
103.6
Cost Index
How the Price Gap Changed
Decatur and Salem share 17 published annual releases from 2008 through 2024. Their overall gap widened, moving from 3.1 to 15.2 RPP points. Salem remained the higher-index metro in the latest release.
Rents changed the most within this pair: its gap moved 27.4 points between the first and latest shared releases (26.7 to 54.1 points). This describes a relative price-index history, not a forecast or a household budget.
| Release Year | Decatur RPP | Salem RPP | Relative Gap |
|---|---|---|---|
| 2008 | 91.0 | 94.1 | 3.1 points Salem higher |
| 2012 | 93.0 | 101.1 | 8.1 points Salem higher |
| 2016 | 88.9 | 97.1 | 8.2 points Salem higher |
| 2020 | 88.3 | 100.9 | 12.6 points Salem higher |
| 2024 | 88.4 | 103.6 | 15.2 points Salem 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 Salem more expensive than Decatur?
Salem is 17.2% more expensive than Decatur. The overall cost index is 103.6 vs 88.4 (national average = 100).
What salary in Salem equals $100K in Decatur?
A $100,000 salary in Decatur has the same purchasing power as $117,221 in Salem. This is based on the BEA Regional Price Parity indexes.
How do rents compare between Decatur and Salem?
Rents in Decatur are indexed at 56.2 while Salem is at 110.3 (national average = 100). Salem 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.