Spencer County stretches along the Ohio River in the southwestern corner of Indiana — Rockport as the county seat, the Lincoln Boyhood National Memorial drawing visitors, and a quiet residential, agricultural, and industrial mix that includes the AK Steel/Cleveland-Cliffs Rockport works and the AEP Rockport coal plant. The 2026 assessment cycle plays out here against a stable rate stack and modest absolute property values, which means AV changes flow through to bills almost dollar-for-dollar.
Form 11 notices typically reach Spencer County mailboxes by mid-May, with the spring tax installment due May 10 and the fall installment due November 10. The appeal window — June 15, 2026, or 45 days after the Form 11 mailing date — is the only opportunity to push back on the AV side of the bill before the rate side locks in for the year.
Spencer County 2026 calendar. Form 11 notices typically mail by mid-May. Spring tax due May 10, 2026; fall installment due November 10, 2026. Form 130 appeal deadline: June 15, 2026, or 45 days after the Form 11 mailing date — whichever is later.
Spencer County's Submarkets
1. Rockport (City of)
The county seat sits directly on the Ohio River across from Owensboro, Kentucky. Standard small-city residential plus older river-front housing stock and the commercial corridor that supports the industrial complex on the south side of town.
2. Lincoln Country and Lincoln City
The Lincoln Boyhood National Memorial area in northern Spencer County draws tourism and seasonal visitor activity. Property mix includes long-held rural residential, smaller acreage parcels, and tourism-adjacent commercial. The 2026 cycle should be checked carefully here — the DLGF cost-table reset hits older residential housing stock harder than the trending model alone would suggest.
3. Industrial Corridor
The Rockport industrial complex (steel and power generation) carries a different assessment story from residential parcels. C&I assessments have moved sharply in the 2025–2026 statewide reset, and large industrial parcels in particular saw substantial cost-table-driven AV jumps. For C&I owners, the 2026 Form 11 deserves a careful comparison against the income-approach evidence supporting the prior valuation.
4. Rural and Agricultural
The bulk of Spencer County's land area. Farmland base-rate movement drives the AV here, set statewide by the DLGF.
What to Verify on a Spencer County Form 11
The statewide Form 11 walkthrough covers the basics. Spencer-specific items:
Ohio River Frontage and Floodplain
River-front parcels carry land coefficients reflecting frontage feet, water access type, and floodplain status. A floodplain coefficient that fell off in error inflates the land AV. Confirm the floodplain treatment on your 2026 notice against the prior year's notice.
Older Housing Stock Condition
Rockport and the surrounding small towns carry housing stock that pre-dates 1970 in significant share. The cost-table valuation assumes typical condition for the structure's class. If your home has documented condition deficiencies — roofing, foundation, systems, exterior — photographs are the strongest appeal evidence.
Homestead Filing for 2025 Closings
If you bought during 2025, confirm with the Spencer County Auditor that your homestead deduction and the SB 1 $300 homestead credit applied to the 2026 roll. Late closings frequently miss the cutoff.
Acreage on Rural Parcels
The breakdown between tillable, woods, residential homesite, and outbuildings determines how much of a parcel benefits from the per-acre ag base rate. Check the breakdown on the Form 11 against actual current use.
Industrial Parcel Income vs. Cost Approach
For industrial parcels, the 2026 cost-table reset may have produced a cost-approach AV that exceeds what an income-approach analysis would support. Income evidence (lease rolls, operating statements) is admissible for the appeal and frequently produces lower AVs than the cost approach for older industrial assets.
Spencer County By the Numbers
| Metric | Spencer County |
|---|---|
| County seat | Rockport |
| Approximate population | ~20,000 |
| Townships | 10 |
| Spring tax due | May 10, 2026 |
| Fall tax due | November 10, 2026 |
| Form 11 mailing | Typically mid-May 2026 |
Filing a Spencer County Form 130
The Spencer County Assessor's office in Rockport accepts Form 130 petitions. Practical filing notes:
- One Form 130 per parcel.
- State your grounds clearly. Market value (with comparable sales), property condition (with photos), or assessment error (acreage, class code, square footage).
- For C&I parcels, attach income evidence. Rent roll, operating statement, capitalization rate support.
- For river-front parcels, lead with land-coefficient analysis.
- Hand-deliver or certified mail near the deadline. Postmark does not control receipt.
- Track acknowledgment within 30 days.
- Pay during pendency. Indiana requires payment of the prior year's tax × current rate while a petition is open.
Full process detail in the statewide appeal guide.
SB 1 Homestead Credit in Spencer County 2026
The 10% / $300 supplemental homestead credit is the new spring 2026 line item below the cap calculation. For a representative Rockport homestead near the local median:
- AV ~$120K, homestead deductions applied
- Post-cap bill ~$700–$800
- 10% credit: $70–$80
- Final spring + fall obligation: ~$650–$720 split across two installments
The credit only applies to properly-filed homesteads. Second homes, rentals, and non-homestead investment parcels do not qualify.
When to Appeal in Spencer County
Strong Spencer County appeal candidates:
- River-front land-coefficient changes that don't track actual frontage or floodplain status.
- Older home improvement-value growth with documented condition deficiencies.
- Industrial parcels where cost-approach AV exceeds income-approach support.
- Rural acreage breakdown errors that misallocate value between ag and residential coding.
- Clerical errors — wrong square footage, bedroom count, class code, or homestead status. Often resolvable informally with the assessor before a Form 130 is needed.
Property Lookup shows the comparable-sales context for any Spencer County parcel. Tax Appeal builds the petition package on contingency.
Find Your Spencer County Property
- Spencer County overview
- Spencer residential parcel data
- Spencer agricultural parcel data
- Spencer commercial parcel data