NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 304-335

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 304-335 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 304 blocks

Most active assignees, all time — NPA 304
CITIZENS TEL CO OF WV DBA FRONTIER OF WV 9
CSC VOICE, LLC 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 304-335-0XXX 0000–0999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
2012-03-23 304-335-1XXX 1000–1999Assigned CSC VOICE, LLC 612K MILL CREEK WV
— 304-335-2XXX 2000–2999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-3XXX 3000–3999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-4XXX 4000–4999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-5XXX 5000–5999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-6XXX 6000–6999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-7XXX 7000–7999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-8XXX 8000–8999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV
— 304-335-9XXX 9000–9999Reserved CITIZENS TEL CO OF WV DBA FRONTIER OF WV 0270 MILL CREEK WV

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.