Industrial park

Lore & Background

Industrial parks are designed to concentrate dedicated infrastructure—such as roadways, railroad sidings, ports, high-power electric supplies, high-end communications cables, large-volume water supplies, and high-volume gas lines—in a delimited area to reduce per-business costs. They also aim to attract new business by providing integrated infrastructure in one location and to set apart industrial uses from urban areas to reduce environmental and social impact. Localized environmental controls specific to the needs of an industrial area are another purpose.

Reader's Guide

Industrial parks serve as a tool for economic development and urban planning, offering a concentrated zone for industrial activity with shared utilities and transportation links. Their significance lies in reducing infrastructure costs for individual businesses and in separating heavy industry from residential areas to mitigate environmental and social impacts. However, the article notes that different industrial parks fulfill these criteria to differing degrees; many small communities have established parks with only basic utilities and highway access, and public transportation options may be limited. In developing countries such as India, additional difficulties include the availability of a skilled workforce and the clustering together of radically different industrial sectors, which can lead to unfavorable outcomes for quality-centered industries. Benchmarking helps rank industrial parks based on performance, investment, environmental protection, social responsibility, and governance, and the performance of park operators is important for the competitiveness of manufacturing companies located there.

Did You Know?

• A common feature of a North American industrial park is a water tower that holds water for the park's demands and firefighting, and advertises the community's name and logo.
• Flatted factories exist in cities like Singapore and Hong Kong, where land is scarce; they are similar to flats but house individual industries, with cargo lifts and sometimes roads serving each level.
• The canton of Geneva, Switzerland, encourages densification of industrial areas and their transformation into mixed-use zones due to a lack of land reserves.
• Industrial parks in developing countries such as India face difficulties including availability of a skilled workforce and clustering of radically different industrial sectors.

Origins and the Drive for Standardization

In the early 1900s, each branch of the U.S. government conducted its own business analysis using proprietary methods and metrics that were essentially meaningless to other agencies. This fragmentation created a pressing need in the 1930s for a unified, standardized approach to measuring, analyzing, and sharing economic data across government branches. The Standard Industrial Classification system emerged from this necessity. It was developed by the Interdepartmental Committee on Industrial Statistics, which had been established by the Central Statistical Board. The committee first published a List of Industries for manufacturing in 1938 and a separate list for non-manufacturing industries in 1939, which together formed the first SIC for the United States. The system was designed to assign four-digit numerical codes to businesses based on shared characteristics in their products, services, production methods, and delivery systems, creating a common language for statistical purposes across all agencies.

The Hierarchy Behind the Four Digits

The SIC code operates on a hierarchical, top-down logic that moves from broad categories to increasingly specific designations. The first two digits identify the major industry sector a business belongs to. The third digit narrows the classification to a sub-group within that sector, and the fourth digit pinpoints the specific specialization. For instance, the digits "36" place a business within the Electronic and Other Equipment sector. Appending a "7" to form "367" indicates the business operates in Electronic Components and Accessories. The final digit, making the code "3672," specifies that the establishment is concerned with Printed Circuit Boards. This progressive narrowing allows researchers and agencies to slice economic data at whatever level of granularity they need, from broad divisional comparisons down to highly specialized product lines. The system also organizes codes into broader groupings—industry group (first three digits), major group (first two digits), and division—enabling flexible aggregation of data across the economic landscape.

Succession by NAICS and Enduring Presence

The SIC system saw its final revision in 1987 and was last employed by the Census Bureau for the 1992 Economic Census. Recognizing that the economy had evolved beyond what a 1930s framework could capture, the Office of Management and Budget established the Economic Classification Policy Committee in 1992 to design a successor. The result was the North American Industry Classification System, a trilateral collaboration among the United States, Canada, and Mexico. NAICS replaced the four-digit SIC with a six-digit code and introduced greater flexibility, including "Other" categories across industry groups to accommodate emerging sectors. It was implemented in the U.S. and Canada in 1997 and in Mexico in 1998. Crucially, NAICS classifies individual establishments by their own output rather than by the parent organization's largest product lines, yielding more precise data on workplace activities. However, this shift altered the meaning of classifications and made some longitudinal data series difficult to sustain. Research by Fort and Klimek in 2016 found that the transition reclassified large numbers of workers, notably moving some from Manufacturing into Services. Despite its replacement, agencies like the SEC continue to rely on SIC codes.

Structural Weaknesses That Drove Reform

Over the decades, the U.S. Census Bureau identified three principal weaknesses in the SIC framework. First, the system struggled with the proper classification of employee groups. A telling example involves administrative assistants working in the automotive industry: although they support every level of the business, SIC placed them within the "Basic Sector" of manufacturing jobs rather than the more accurate "Non-Basic" category. Second, the codes were originally crafted for a pre-1970 economy dominated by manufacturing. As the American economy shifted toward services, the rigid four-digit structure proved increasingly inadequate for capturing the reality of modern business. Third, the SIC system was slow to recognize and incorporate new and emerging industries, particularly those in computer technology, software development, and information technology. These limitations collectively underscored why a more adaptable classification framework was ultimately necessary, and they informed the design choices made when NAICS was developed to replace the aging system.