B2B contacts in SIC U.S. Postal Service (4311)
RampedUp holds 5,904 professional profiles for U.S. Postal Service (4311) as of the build — 0.0% of all profiles carrying a SIC code, and 0.0% of the global file. Of those, 3,143 carry a professional email address and 93 carry a mobile number. Ranked #290 of 587 SIC codes.
What the records carry
Field coverage for U.S. Postal Service (4311), counted from the October 2026 build. The global column is there so you can see whether this slice runs above or below the file as a whole.
| Field on the record | U.S. Postal Service (4311) records | Share of U.S. Postal Service (4311) | Global share |
|---|---|---|---|
| Professional email | 3,143 | 53.2% | 19.3% |
| Personal email | 317 | 5.4% | 13.3% |
| Phone (any) | 5,138 | 87.0% | 35.3% |
| Mobile number | 93 | 1.6% | 7.4% |
| Primary contact record | 2,741 | 46.4% | 32.1% |
| All five present on one record | 13 | 0.2% | 1.6% |
Go deeper in the Count Explorer
Everything above is an exact count for U.S. Postal Service (4311) on its own. To put U.S. Postal Service (4311) together with a second filter — a title level, a job function, a company size band, a revenue band — open it in the Count Explorer. It arrives with U.S. Postal Service (4311) already selected, and it tells you on every answer whether the number is exact or an estimate.
- U.S. Postal Service (4311) with a mobile number93
- U.S. Postal Service (4311) with a professional email address3,143
- U.S. Postal Service (4311) with all five fields present13
Why a second filter changes the answer. The October 2026 cube holds one dimension at a time, so a count for U.S. Postal Service (4311) on its own is read straight out of it and is exact. Combine U.S. Postal Service (4311) with a second dimension and the cube has no such cell — the explorer estimates it, shows the ceiling it cannot exceed, and labels it an estimate rather than passing it off as a measured number.
Comparable SIC codes
The SIC codes ranked either side of U.S. Postal Service (4311) by profile count.
| # | SIC code | Profiles | Professional email | Mobile |
|---|---|---|---|---|
| 288 | Crude Petroleum & Natural Gas (1311) | 6,077 | 2,641 | 710 |
| 289 | Commercial Banks, Nec (6029) | 5,917 | 3,292 | 1,094 |
| 291 | Loan Brokers (6163) | 5,861 | 2,736 | 1,639 |
| 292 | Books, Periodicals, & Newspapers (5192) | 5,012 | 2,030 | 591 |
Questions about this slice
How many U.S. Postal Service (4311) contacts does RampedUp have?
RampedUp holds 5,904 professional profiles for U.S. Postal Service (4311) as of the October 2026 build, which is 0.0% of all profiles carrying a SIC code and 0.0% of the global file of 893,501,354.
How many U.S. Postal Service (4311) contacts have an email address?
3,143 carry a professional email address (53.2% of U.S. Postal Service (4311) records) and 317 carry a personal email address (5.4%).
How many U.S. Postal Service (4311) contacts have a phone number?
5,138 carry a phone number of some kind (87.0%), of which 93 are mobile numbers (1.6% of U.S. Postal Service (4311) records).
Need this cross-filtered?
These are exact counts for U.S. Postal Service (4311) on its own. For U.S. Postal Service (4311) combined with a title level, a company size or a required field, use the explorer — or ask and we will run it against the live file.