66/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,369 Google reviews, listed on Google as “Pest control service”.
Best Pest Control Companies in Merrimack, NH (2026)
67 pest control companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Merrimack: Mosquito Squad of Southern New Hampshire, CR Score 66/100; 4.9★ from 1,369 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Fox Pest Control Manchester, posts 24/7 hours; ranked #2 of 67.
- 2
Most-reviewed: Fox Pest Control Manchester, 2,084 Google reviews at 4.7★, the most of 67 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
67 Merrimack pest control companies are ranked here by CR Score, from ten published factors. 21 are open 24/7, 52 open Saturdays and 31 open Sundays, based on posted hours. The median Google rating is 4.9★ across 67 rated businesses.
Most of this list also appears on the Pest control companies in Manchester ranking. See Pest control companies in Manchester
Top 10 pest control companies in Merrimack at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mosquito Squad of Southern New Hampshire | 66 | 4.9★ (1,369) | Merrimack | Sat · Sun · Evenings | Overall |
| 2 | Fox Pest Control Manchester | 65 | 4.7★ (2,084) | Manchester, 9 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Insight Pest Solutions | 64 | 4.8★ (1,335) | Manchester, 6 mi away | Sat · Sun · Evenings | — |
| 4 | Mosquito Joe of Bedford-Amherst NH | 63 | 5.0★ (209) | Nashua, 6 mi away | 24/7 | — |
| 5 | Orkin | 63 | 4.7★ (1,254) | Manchester, 11 mi away | 24/7 | — |
| 6 | Insight Pest Solutions | 63 | 4.9★ (1,028) | Nashua, 11 mi away | Sat · Sun · Evenings | — |
| 7 | Anchor Pest Services | 63 | 4.9★ (1,392) | Manchester, 6 mi away | Sat | — |
| 8 | Garfield Pest Control | 61 | 4.9★ (189) | Merrimack | Sat | — |
| 9 | Aptive Pest Control | 59 | 4.5★ (740) | Manchester, 6 mi away | Sat · Evenings | — |
| 10 | Mosquito Joe of Southern New Hampshire | 59 | 4.9★ (417) | Manchester, 25 mi away | 24/7 | — |
The 67 best pest control companies in Merrimack, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Manchester, 9 mi away
65/100CR ScoreRanked #2 because of its Google rating and review volume: 4.7★ from 2,084 Google reviews, the most in Merrimack.
Based in Manchester, 6 mi away
64/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 1,335 Google reviews, listed on Google as “Pest control service”.
Based in Nashua, 6 mi away
63/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 209 Google reviews, listed on Google as “Pest control service”.
#5 Orkin
Based in Manchester, 11 mi away
63/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.7★ from 1,254 Google reviews, listed on Google as “Pest control service”.
Based in Nashua, 11 mi away
63/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 1,028 Google reviews, listed on Google as “Pest control service”.
Based in Manchester, 6 mi away
63/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 1,392 Google reviews, listed on Google as “Pest control service”.
Based in Merrimack
61/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 189 Google reviews, listed on Google as “Pest control service”.
Based in Manchester, 6 mi away
59/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.5★ from 740 Google reviews, listed on Google as “Pest control service”.
Based in Manchester, 25 mi away
59/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 417 Google reviews, listed on Google as “Pest control service”.
Based in Manchester, 14 mi away
59/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 409 Google reviews, listed on Google as “Pest control service”.
Based in Salem, 15 mi away
59/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 165 Google reviews, listed on Google as “Pest control service”.
#13 A1 Exterminators
Based in Nashua, 5 mi away
59/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.8★ from 193 Google reviews, listed on Google as “Pest control service”.
Based in Salem, 14 mi away
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 399 Google reviews, listed on Google as “Pest control service”.
#15 Mainely Grass
Based in Bedford, 5 mi away
59/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 519 Google reviews, listed on Google as “Pest control service”.
Based in North Andover, 24 mi away
59/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 338 Google reviews, listed on Google as “Pest control service”.
Based in North Andover, 22 mi away
59/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 126 Google reviews, listed on Google as “Pest control service”.
Based in Hudson, 8 mi away
58/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Pest control service”.
Based in Auburn, 12 mi away
58/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Pest control service”.
Based in Lowell, 18 mi away
58/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.8★ from 226 Google reviews, listed on Google as “Pest control service”.
Based in Manchester, 13 mi away
58/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 177 Google reviews, listed on Google as “Pest control service”.
Based in Nashua, 11 mi away
58/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.8★ from 195 Google reviews, listed on Google as “Pest control service”.
Based in Lowell, 23 mi away
57/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 448 Google reviews, listed on Google as “Pest control service”.
#24 Terminix
Based in Andover, 23 mi away
57/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 94 Google reviews, listed on Google as “Pest control service”.
Based in Lowell, 8 mi away
57/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Pest control service”.
How we ranked Merrimack pest control companies
We scored 67 Merrimack pest control companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 3, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Merrimack data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
Pest control companies in Merrimack: frequently asked questions
Who is the best pest control company in Merrimack?
By CR Score, the highest-ranked pest control company in Merrimack, NH is Mosquito Squad of Southern New Hampshire with a CR Score of 66/100. It has 4.9★ from 1,369 Google reviews. It is open 7 days a week. Fox Pest Control Manchester (#2) and Insight Pest Solutions (#3) follow. We ranked 67 pest control companies on ten factors, last updated November 3, 2026.
How many pest control companies are there in Merrimack?
ContractorsRanked ranks 67 pest control companies serving Merrimack, NH. 2 of them are based in Merrimack; the rest serve it from nearby towns. Counts are as of November 2026.
Which pest control companies in Merrimack are open 24/7?
21 ranked pest control companies in Merrimack post 24/7 hours. The highest-ranked are Fox Pest Control Manchester (#2), Mosquito Joe of Bedford-Amherst NH (#4) and Orkin (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pest control companies in Merrimack work on weekends?
52 of 67 ranked pest control companies post Saturday hours and 31 post Sunday hours. The highest-ranked open Saturdays are Mosquito Squad of Southern New Hampshire (#1), Fox Pest Control Manchester (#2) and Insight Pest Solutions (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Merrimack pest control companies have?
The median Google rating among 67 rated pest control companies in Merrimack is 4.9★, with a median of 72 reviews. Fox Pest Control Manchester has the most, 2,084 reviews, and ranks #2. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank pest control companies?
Each pest control company gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do pest control companies outside Merrimack count in this ranking?
Yes, if they are within 25 mi of the Merrimack city center, our service radius for pest control companies. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can pest control companies pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Merrimack
- November 2026: CR Scores recalculated for 67 pest control companies serving Merrimack.
More pest control companies and Merrimack pages
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