> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/423310/ # NAICS code 423310: Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers The companies classified under NAICS 423310, where they are based, how big they are and how the code maps to SIC. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** NAICS 423310 is the code for Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers, in sector 42: Wholesale Trade. The companies counted under it are mostly very small: 61% have 50 or fewer employees, and 87% are headquartered in the United States. ## What is NAICS 423310? NAICS 423310 is the code for Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers. It belongs to sector 42: Wholesale Trade. NAICS, the North American Industry Classification System, is the standard U.S. government agencies use to sort businesses by what they mainly do, and each digit narrows the category. Most of the companies counted also carry SIC 5031, Wholesale lumber, plywood and millwork, in the older SIC system (82%). - 61% of the companies counted have 50 or fewer employees, and the middle one is in the 11 to 50 range. - The largest group is headquartered in the United States (87%). Within the US, California is the biggest state (12%). - Most were founded in the before 1960 (20%), then the 1990s (18%). **Figure: How NAICS 423310 is built.** The code 423310 split into its parts: sector 42, then subsector, industry group, NAICS industry and U.S. industry. *The six digits of NAICS 423310. Each digit narrows the category.* ## Which companies are classified under NAICS 423310? The biggest by headcount range include Ply Gem, Chadwell Supply, Ll Flooring, Baillie Lumber and Kolbe Windows & Doors. Names link to a company profile where we have one. | Company | Headquarters | Employees | | --- | --- | --- | | Ply Gem | Cary, NC | 10,001+ | | Chadwell Supply | Tampa, FL | 1,001 to 5,000 | | Ll Flooring | Richmond, VA | 1,001 to 5,000 | | Baillie Lumber | Hamburg, NY | 1,001 to 5,000 | | Kolbe Windows & Doors | Wausau, WI | 1,001 to 5,000 | | Optimera | Oslo, Norway | 1,001 to 5,000 | | Sierra Pacific Windows | Red Bluff, CA | 1,001 to 5,000 | | Reeb Millwork | Bethlehem, PA | 1,001 to 5,000 | | Starline Windows | Surrey, Canada | 1,001 to 5,000 | | Window Nation | Fulton, MD | 501 to 1,000 | | Parksite | Batavia, IL | 501 to 1,000 | | Orepac Building Products | Wilsonville, OR | 501 to 1,000 | | Newsouth Window Solutions | Tampa, FL | 501 to 1,000 | | Millar Western Forest Products | Edmonton, Canada | 501 to 1,000 | | Pacific Coast Supply | North Highlands, CA | 501 to 1,000 | | Sierra Forest Products | West Chicago, IL | 501 to 1,000 | | Rugby Architectural Building Products | Concord, NH | 501 to 1,000 | | Yak Access | Columbia, MS | 501 to 1,000 | | Ring's End | Darien, CT | 501 to 1,000 | | Dyke Industries | Little Rock, AR | 501 to 1,000 | | Starmark Cabinetry | Sioux Falls, SD | 501 to 1,000 | | Stark Truss | Canton, OH | 501 to 1,000 | | Royal Electric | Sacramento, CA | 201 to 500 | | Allegheny Millwork | Lawrence, PA | 201 to 500 | | Lumbermen's | Byron Center, MI | 201 to 500 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Where are NAICS 423310 companies based? The largest groups are headquartered in the United States (87%), Canada (6%) and Switzerland (2%). **Figure: Where companies in NAICS 423310 are based.** Bars for the share of counted companies in NAICS 423310 headquartered in each country: United States 87%, Canada 6%, Switzerland 2%. *Share of counted companies in NAICS 423310 by headquarters country.* Within the United States, California (12%), Florida (11%) and Texas (7%) lead. **Figure: US headquarters of companies in NAICS 423310, by state.** A tile map of the United States shaded by the share of counted US companies in NAICS 423310 headquartered in each state. The largest are California 12%, Florida 11%, Texas 7%. *Share of counted US companies in NAICS 423310 by headquarters state. The three largest states are outlined.* ## How big are the companies counted for NAICS 423310? 61% of them have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of companies in NAICS 423310.** Seven columns for the share of counted companies in NAICS 423310 in each employee range: 11 to 50 61%, 51 to 200 25%, 201 to 500 8%, 501 to 1,000 3%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted companies in NAICS 423310 in each employee range.* ## How old are NAICS 423310 companies? Most were founded in the before 1960 (20%), then the 1990s (18%). **Figure: When companies in NAICS 423310 were founded.** Eight columns for the share of counted companies in NAICS 423310 founded in each era: Before 1960 20%, 1960s 8%, 1970s 11%, 1980s 12%, 1990s 18%, 2000s 15%, 2010s 15%, 2020s 1%. *Share of counted companies in NAICS 423310 by the era they were founded in, for the ones that list a founding year.* ## How NAICS 423310 compares - 16% were founded in 2010 or later, against 30% across all NAICS codes on this site. - Florida holds 11% of the US companies here, against 7% across all NAICS codes on this site. ## How do NAICS 423310 companies describe themselves? A code is assigned by classification, and a company does not choose its own, so the label a company uses for itself can differ. The most common labels here are Wholesale Building Materials (38%), Construction (37%) and Building Materials (11%). **Figure: How companies in NAICS 423310 describe themselves.** Bars for the share of counted companies in NAICS 423310 that give each industry on their public profile: Wholesale Building Materials 38%, Construction 37%, Building Materials 11%, Wholesale 7%. *Share of counted companies in NAICS 423310 by the industry they list on their public profile.* ## NAICS 423310 and the SIC system NAICS replaced SIC in 1997, but the two do not line up one to one: companies filed under one NAICS code can carry several SIC codes. These are the ones seen most. | Code | Title | Share of counted | | --- | --- | --- | | SIC 5031 | Wholesale lumber, plywood and millwork | 82% | | [SIC 5211](https://enrich.chat/naics/444180/) | Retail lumber and building materials | 10% | ## Where NAICS codes come from NAICS is maintained by the U.S. Census Bureau with Canada and Mexico and revised every five years; the current edition is NAICS 2022. To check exactly what a code includes, search the [official NAICS index](https://www.census.gov/naics/) or read the Census Bureau's [guide to understanding NAICS](https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html). Pick a code by what a company mostly does, not by who it sells to. ## How do you reach the people at NAICS 423310 companies? The people to talk to are usually sales, supply chain and procurement leaders. You can build the list from this code in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 423310 (Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers) ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the sales, supply chain and procurement leaders at companies with NAICS code 423310, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Codes next to it: [NAICS 423320: Brick, Stone, and Related Construction](https://enrich.chat/naics/423320/) Others in sector 42: [NAICS 423450: Medical, Dental, and Hospital Equipment](https://enrich.chat/naics/423450/)[NAICS 423430: Computer and Computer Peripheral Equipment](https://enrich.chat/naics/423430/)[NAICS 423610: Electrical Apparatus and Equipment, Wiring](https://enrich.chat/naics/423610/)[NAICS 424690: Other Chemical and Allied Products Merchant](https://enrich.chat/naics/424690/)[NAICS 423810: Construction and Mining Machinery](https://enrich.chat/naics/423810/)[NAICS 423120: Motor Vehicle Supplies and New Parts](https://enrich.chat/naics/423120/)[NAICS 423420: Office Equipment Merchant Wholesalers](https://enrich.chat/naics/423420/)[NAICS 423510: Metal Service Centers and Other Metal](https://enrich.chat/naics/423510/) ## Frequently asked questions ### What is NAICS code 423310? NAICS 423310 is the code for Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers, in sector 42: Wholesale Trade. ### What is the SIC code for NAICS 423310 (Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers)? 82% of the companies counted carry SIC 5031 (Wholesale lumber, plywood and millwork), but the two systems do not map one to one. ### Which companies are classified under NAICS 423310? The biggest by headcount range include Ply Gem, Chadwell Supply, Ll Flooring, Baillie Lumber and Kolbe Windows & Doors. The page lists 25 with links to their profiles where we have them. ### Where are NAICS 423310 companies based? The largest groups are headquartered in the United States (87%), Canada (6%) and Switzerland (2%). ### How big are the companies in NAICS 423310? 61% have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. ### Is NAICS 423310 the same as a SIC code? No. NAICS replaced SIC as the U.S. federal standard in 1997, and the two do not map one to one. The SIC code seen most among these companies is 5031. ## Try this prompt Find the people at NAICS 423310 companies ```text Use www.enrich.chat to find the sales, supply chain and procurement leaders at companies with NAICS code 423310, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 423320](https://enrich.chat/naics/423320/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)