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As of August 01, 2026, the average salary for an Office Assistant III in Illinois is $47,773 per year, which breaks down to an hourly rate of $23.
However, an Office Assistant III's salary can vary significantly. Here’s a look at the typical salary range:
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Office Assistant III Salaries by Percentile
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $54,973 | $4,581 | $1,057 | $26 |
| Average | $47,773 | $3,981 | $919 | $23 |
| 25th Percentile | $44,303 | $3,692 | $852 | $21 |
State of Illinois - Sumner, IL
Landmark Ford East, Inc - Springfield, IL
Sarah Bush Lincoln - Mattoon, IL
Perry's Steakhouse and Grille - Vernon Hills, IL
An Office Assistant III's salary isn't a fixed number. It's shaped by several important factors. Below, we'll explore how your years of experience, geographic location, and company size can directly affect your earning potential.
Experience is a primary driver of an Office Assistant III's salary. As you build your skills and take on more complex tasks, your compensation generally increases. Here's how the average salary grows at different career stages:
| Job Role | Years of Experience | Average Salary |
|---|---|---|
| Administrative Services - Clerical - Entry | 0-1 years | $38,872 |
| Administrative Services - Clerical - Intermediate | 1-3 years | $43,189 |
| Office Assistant III | 3-5 years | $47,759 |
| Clerical Support Supervisor | 5+ years | $67,396 |
What Am I Worth?
Your salary can change significantly depending on where you work. States with a higher cost of living and strong industrial sectors often pay more to attract Office Assistant IIIs. For example, consider the average annual salaries in these key locations:
Salaries can also vary between different cities. Major metropolitan areas or cities with a high demand for technicians often offer more competitive pay. Here are a few examples of average annual salaries in different U.S. cities:
Office Assistant III salary potential scales significantly with company size. Data shows that Enterprise companies (5,000+ employees) pay the highest average salary at around $53,479. While startup companies pay approximate $45,242.
| Company Size | Employees | Average Salary |
|---|---|---|
| Startup | 1~50 | $45,242 |
| Growth Stage | 51~500 | $47,849 |
| Established | 501~5000 | $51,644 |
| Enterprise | 5000+ | $53,479 |
For Office Assistant III roles, the industry you choose can affect earning potential by as much as 75% (the gap between the highest and lowest paying industries). Data shows that the Biotechnology and Software & Networking sectors offer the strongest compensation, at 25% above the average. In contrast, Office Assistant positions in Transportation or Edu., Gov't. & Nonprofit typically offer lower base pay, as these industries often view Office Assistant III as a support function rather than a direct revenue driver.
| Industry Sector | Average Annual Salary | Average Hourly Rate | Pay vs.Avg |
|---|---|---|---|
| Biotechnology | $59,716 | $29.0 | 25% |
| Software & Networking | $59,716 | $29.0 | 25% |
| Energy & Utilities | $57,328 | $28.0 | 20% |
| Financial Services | $57,328 | $28.0 | 20% |
| Pharmaceuticals | $57,328 | $28.0 | 20% |
Understanding how an Office Assistant III's annual salary breaks down can help with budgeting. Below, you can see the average hourly rate, weekly pay, and monthly pay for this role. Use the buttons to switch between different pay periods.
| Annual Salary | Monthly Pay | Weekly Pay | Hourly Wage | |
|---|---|---|---|---|
| 75th Percentile | $54,973 | $4,581 | $1,057 | $26 |
| Average | $47,773 | $3,981 | $919 | $23 |
| 25th Percentile | $44,303 | $3,692 | $852 | $21 |
For an Office Assistant III, the most direct path to higher earnings is advancing to the Clerical Support Supervisor role. This promotion typically comes with a significant pay increase, bringing the average annual salary to $67,400 - a projected growth of 41% over your current level.
Ready to take the next step in your career? Browse thousands of current Office Assistant III job openings on our job board. Use the search bar below to find your perfect match.
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