As of July 01, 2026, the average salary for a Library Assistant IV in Illinois is $62,400 per year, which breaks down to an hourly rate of $30.
However, a Library Assistant IV's salary can vary significantly. Here’s a look at the typical salary range:
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Library Assistant IV Salaries by Percentile
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $67,642 | $5,637 | $1,301 | $33 |
| Average | $62,400 | $5,200 | $1,200 | $30 |
| 25th Percentile | $56,586 | $4,716 | $1,088 | $27 |
Naperville Public Library - Naperville, IL
TradeJobsWorkforce - Plano, IL
TradeJobsWorkforce - El Paso, IL
Champaign Public Library - Champaign, IL
A Library Assistant IV'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 a Library Assistant IV'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 |
|---|---|---|
| Library Assistant II | 1-3 years | $43,341 |
| Library Assistant III | 3-5 years | $55,902 |
| Library Assistant IV | 5-7 years | $62,400 |
| Library Services Supervisor | 7+ years | $90,291 |
| Library Services Manager | 7+ years | $104,765 |
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 Library Assistant IVs. 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:
Library Assistant IV salary potential scales significantly with company size. Data shows that Enterprise companies (5,000+ employees) pay the highest average salary at around $69,793. While startup companies pay approximate $59,024.
| Company Size | Employees | Average Salary |
|---|---|---|
| Startup | 1~50 | $59,024 |
| Growth Stage | 51~500 | $62,427 |
| Established | 501~5000 | $67,399 |
| Enterprise | 5000+ | $69,793 |
For Library Assistant IV roles, the industry you choose can affect earning potential by as much as 92% (the gap between the highest and lowest paying industries). Data shows that the Internet and Software & Networking sectors offer the strongest compensation, at 40% above the average. In contrast, Library Assistant positions in Transportation or Hospitality & Leisure typically offer lower base pay, as these industries often view Library Assistant IV as a support function rather than a direct revenue driver.
| Industry Sector | Average Annual Salary | Average Hourly Rate | Pay vs.Avg |
|---|---|---|---|
| Internet | $87,359 | $42.0 | 40% |
| Software & Networking | $84,239 | $40.0 | 35% |
| Financial Services | $81,119 | $39.0 | 30% |
| Biotechnology | $77,999 | $37.0 | 25% |
| Pharmaceuticals | $74,879 | $36.0 | 20% |
Understanding how a Library Assistant IV'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 | $67,642 | $5,637 | $1,301 | $33 |
| Average | $62,400 | $5,200 | $1,200 | $30 |
| 25th Percentile | $56,586 | $4,716 | $1,088 | $27 |
Promotions are the fastest way to increase your earnings. As a Library Assistant IV, you have the following paths for advancement. The table below compares the salary raises for common next-step roles. By comparing these figures, you can choose the career path that best meets your financial goals.
| Next Step Role | Estimate Salary | Projected Raise |
|---|---|---|
| Library Services Supervisor | $90,291 | 45% |
| Medical Library Services Manager | $96,316 | 54% |
| Library Technical Services Manager | $132,292 | 112% |
Ready to take the next step in your career? Browse thousands of current Library Assistant IV job openings on our job board. Use the search bar below to find your perfect match.
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