As of November 01, 2025, the average salary for an Administrative Assistant III in Oak Brook, IL is $64,940 per year, which breaks down to an hourly rate of $31.
However, an Administrative Assistant III's salary can vary significantly. Here’s a look at the typical salary range:
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Administrative Assistant III Salaries by Percentile
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $72,413 | $6,034 | $1,393 | $35 |
| Average | $64,940 | $5,412 | $1,249 | $31 |
| 25th Percentile | $58,358 | $4,863 | $1,122 | $28 |
Pyramid Consulting, Inc - Round Lake, IL
American Health Center - Arlington Heights, IL
American Health Center - Arlington Heights, IL
Abacus Staffing - Deerfield, IL
An Administrative 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, skills and company size can directly affect your earning potential.
Experience is a primary driver of an Administrative 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:
| Levels | Salary |
|---|---|
| Entry Level Administrative Assistant III | $61,168 |
| Intermediate Level Administrative Assistant III | $61,659 |
| Senior Level Administrative Assistant III | $62,934 |
| Specialist Level Administrative Assistant III | $64,897 |
| Expert Level Administrative Assistant III | $68,706 |
What Am I Worth?
Salaries can also vary between different cities, even within the same state. 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 Illinois cities:
Demanded Skills for the Role:
| Skills | Demand Percentage |
|---|---|
| Customer Service | 9.97% |
| Accounting | 2.93% |
| Purchasing | 1.24% |
| Skill | Salary | Salary % Increase |
|---|---|---|
|
Project Management
|
$71,434 |
10%
|
|
Consulting
|
$70,784 |
9%
|
|
Leadership
|
$70,135 |
8%
|
|
Collaboration
|
$69,485 |
7%
|
|
Innovation
|
$69,485 |
7%
|
|
Analysis
|
$68,187 |
5%
|
Understanding how an Administrative 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 | $72,413 | $6,034 | $1,393 | $35 |
| Average | $64,940 | $5,412 | $1,249 | $31 |
| 25th Percentile | $58,358 | $4,863 | $1,122 | $28 |
Ready to take the next step in your career? Browse thousands of current Administrative Assistant III job openings on our job board. Use the search bar below to find your perfect match.
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