A single San Bernardino County assessment number can come from a tax-billing combination as well as a lot merger. The Assessor’s Parcel Combination and Rescission Guidelines, AOS-047, revised January 2025, distinguish an assessment-only combination from a planning merger associated with a recorded Notice of Merger and a later deed carrying the merged description. To answer what happened, find the Assessor change, the responsible planning record, and the named recorded instruments as separate papers. A current parcel display or tax bill is a lead to that history.
This is a copy-and-identity task. Whether a particular parcel is legally merged, separately saleable or developable is a question for the responsible planning office. The County’s Lot Merger page likewise distinguishes a recorded merger document from an Assessor combination for tax billing. Its new-application instructions are written for applicants starting a merger today.
Decide whether your folder shows an Assessor combination or a planning merger
Write the former and current assessor parcel numbers, source dates, jurisdiction, and exact document title on a two-branch sheet:
| Assessment combination | Planning merger |
|---|---|
| Recover: Assessor combination record and identifier-change date. | Recover: Planning action, recorded Notice of Merger, and deed with new description. Keep planning and instrument numbers and dates together. |
| Ask: County Assessor for the retained record explaining the change if only a tax bill survives. | Ask: Responsible County or City Planning office for the action; Recorder-Clerk for instrument images. |
The two branches may appear in one property folder, so keep each on its own line instead of a single “APNs combined” label. AOS-047 sends a formal-merger reversal question to the responsible County or City Planning office and treats reversal of an assessment combination separately; whether either action is available for a property is that office’s call. The County Lot Merger page gives a Planning contact for the County route; a site inside an incorporated city can have a different planning custodian.
Imagine a wholly fictional “Juniper Court” folder. Two older tax bills show Parcel A and Parcel B; a later bill shows one number. The folder contains an email saying a merger was discussed, and no Planning action, Notice of Merger or recorded deed is attached. The folder documents a change in the assessment reference without explaining it. The open question is whether a distinct planning-and-recording trail exists for the same described property, and the email, tax bill or a web search can only point toward it.
For this fictional inquiry, keep one line for each known item: former/current APNs and bill dates; any planning case and jurisdiction; Notice of Merger title, number and date; and deed number and description if located. If an instrument names a different owner or area, preserve the mismatch. Former and current APNs are useful clues for staff; ask the Recorder which search fields it accepts.
Ask San Bernardino County for the exact missing document
The current Assessor-Recorder forms directory still lists AOS-047 under Assessor, a Recorder-Clerk copy-request route, and public-records or information-request forms. For a tax-administration gap, ask the Assessor which existing combination record accounts for the former and current APNs and approximate change period. For a planning gap, name the affected city or unincorporated area, any known action number, and the Notice of Merger or other specific file sought. The County Planning contact covers unincorporated areas; a city’s planning action sits with that city.
For a recorded Notice of Merger or deed, the County Recorder’s official-records page describes a 1925-to-present index rather than online document images. It searches by document number, recording date, title and party names rather than by address. Carry a known instrument reference into the copy inquiry; the page documents viewing and copy routes. An empty index search leaves the merger, deed or permit question open.
The San Bernardino map-correction guide addresses a different question: a Certificate of Correction tied to an existing subdivision-map sheet. The building permit records guide explains where permit issuance, inspections and occupancy approval are recorded, separately from parcel numbers and merger papers. Match the record class before drawing a conclusion from a single parcel number.
San Bernardino County Assessor-Recorder and Lot Merger pages checked October 6, 2026.