Glossary
Solicitation number
A solicitation number is the reference an agency assigns to a procurement, a string such as IFB 2026-014-PW or RFP-24-0087. It appears on the advertisement, the bid documents, every addendum, the question log, the bid tabulation and, later, the contract.
It is administrative rather than substantive, but it does real work: it is how a submission gets routed to the right file, how a question gets matched to the right procurement, and how you find the record afterward.
The short version
- Put the solicitation number on the outer envelope or in the portal field exactly as written. Mis-numbered bids get opened at the wrong time or not at all.
- Prefixes usually encode the method (IFB, ITB, RFP, RFQ, ITN), which tells you how you will be evaluated before you open the document.
- Numbers change when a solicitation is canceled and reissued. Confirm you are working from the current one.
- It is the search key for the public record: tabulations, award memos and prior-cycle documents are all filed under it.
Why it matters to a bidder
Small process failures around the number cause outsized problems:
- Sealed bid labeling. Most instructions require the solicitation number, the project title and the opening date on the outside of the sealed envelope. An unlabeled envelope may be opened early by mailroom staff, which can disqualify the bid.
- Questions must cite it. Agencies running dozens of concurrent solicitations route questions by number. An uncited question may never be answered.
- Use it for research. Searching the prior cycle's number on the agency portal usually surfaces the previous tabulation, the award and often the incumbent's pricing. That is the fastest way to understand what a re-compete is worth. See incumbent.
- Track cancellations. A reissued solicitation typically gets a new number, and bid boards sometimes list both.
A real example
A contractor delivers a sealed bid to a county clerk marked only with the project name. The county has two related packages opening the same week under different numbers. The clerk logs the envelope against the wrong solicitation, and it is not present at the correct opening. The bid is treated as not received. The contractor's price would have won by $22,000. The instructions to bidders had required the solicitation number on the envelope exterior.
How state and local differs from federal
Federal solicitation numbers follow a standardized format under the FAR's uniform procurement instrument identifier rules, and every notice lives in one place, SAM.gov, so a single search covers the government.
State and local numbering is entirely local convention. Formats differ between the city and the county in the same metro area, and often between departments of the same agency. There is no national index: opportunities are posted to state e-procurement systems, county portals, school district sites, third-party bid platforms and, in smaller jurisdictions, newspaper legal notices. That fragmentation is precisely why bidders miss opportunities they were qualified for, and why the identifier matters. Once you have the number, everything else about that procurement becomes findable through the agency's portal or a public records request.
Common questions
What do the prefixes mean?
They usually encode the method and the year: IFB or ITB for sealed bids, RFP for proposals, RFQ for quotes, ITN for negotiation. Conventions are set by each agency.
Does the number change with an addendum?
No. Addenda are numbered separately and reference the solicitation number.
What if a solicitation is canceled and reissued?
It normally receives a new number. Confirm which one is active before submitting.
Where do I find past solicitations?
On the agency's procurement portal, searchable by number, or by requesting the file under the state's public records law.